feat(web): v2 看板前端接入真实数据接口

前端样式完全沿用 2.0 设计稿，仅替换数据来源。

- templates/index.html 改用设计稿 DOM 结构与类名，引用 styles.css + weapi.js + app.js
- static/css/styles.css 引入 2.0 设计稿样式
- static/js/weapi.js 新增，封装 /api/v2/* 调用为全局 WeApi
- static/js/app.js 重写：保留设计稿全部渲染函数与 CSS 类名，
  数据源由 demo-data.js 静态假数据改为真实接口，
  补充异步加载器、加载/错误状态机与重试按钮
- static/js/demo-data.js 保留为设计稿原始假数据对照

static/css/styles.css

@@ -0,0 +1,11 @@
+
+:root{--bg:#f7f8fa;--panel:#fff;--text:#242a34;--muted:#9298a4;--line:#edf0f3;--accent:#356ce5;--soft:#edf3ff;--sidebar:#fff;--shadow:0 8px 32px #24355005;--quote:#f8f6f1;--green:#449682}
+[data-theme=dark]{--bg:#14171e;--panel:#1d222c;--text:#e7eaf0;--muted:#8892a4;--line:#2c323f;--accent:#80a5ff;--soft:#26344e;--sidebar:#191d26;--shadow:0 8px 32px #0001;--quote:#292820;--green:#75c6ac;color-scheme:dark}
+*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:"PingFang SC","Microsoft YaHei",sans-serif;font-size:14px;transition:background .25s,color .25s}button,input{font:inherit}button{cursor:pointer;color:inherit}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid var(--accent);outline-offset:4px}button{border:0;background:none}svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;vertical-align:middle}.sidebar{position:fixed;inset:0 auto 0 0;width:218px;padding:39px 23px 24px;background:var(--sidebar);border-right:1px solid var(--line);display:flex;flex-direction:column;z-index:5}.logo{display:flex;align-items:center;gap:11px;font-size:24px;font-weight:650;letter-spacing:2px}.logo-mark{background:#356ce5;color:white;width:37px;height:37px;display:grid;place-items:center;border-radius:12px}.logo-mark svg{width:25px;height:25px}.logo small{display:block;letter-spacing:2px;font-size:9px;color:var(--muted);margin-top:3px;font-weight:500}.navlabel{font-size:10px;color:var(--muted);letter-spacing:1.7px;margin:53px 14px 15px}.nav{display:flex;flex-direction:column;gap:9px}.nav button{text-align:left;padding:14px 17px;border-radius:9px;display:flex;align-items:center;gap:13px;color:#818997}.nav button.active{color:var(--accent);background:var(--soft);font-weight:600}.nav button:hover{background:var(--soft)}.nav em{margin-left:auto;font-size:10px;font-style:normal;background:var(--line);padding:2px 6px;border-radius:4px}.sidebar-bottom{margin-top:auto}.connection{padding:16px 12px;border:1px solid var(--line);border-radius:10px;font-size:12px;line-height:1.9}.dot{display:inline-block;background:var(--green);width:6px;height:6px;border-radius:50%;margin-right:7px}.connection small{display:block;font-size:10px;color:var(--muted)}.profile{display:flex;align-items:center;gap:10px;margin-top:24px;padding:0 8px}.avatar{width:33px;height:33px;border-radius:50%;display:grid;place-items:center;background:#e4eadf;color:#5e7252;font-family:Georgia;font-size:18px}.profile small{display:block;font-size:10px;color:var(--muted);margin-top:4px}.main{margin-left:218px;padding:0 40px 32px;max-width:1800px}.topbar{height:91px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.breadcrumb{font-size:12px;color:var(--muted)}.breadcrumb span{color:var(--text);margin-left:12px}.top-actions{display:flex;align-items:center;gap:20px}.searchbox{display:flex;align-items:center;gap:10px;color:var(--muted);background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:9px 12px}.searchbox input{background:none;border:0;outline:none;width:180px;color:var(--text);font-size:11px}.key{font-size:10px;border:1px solid var(--line);border-radius:4px;padding:2px 4px}.iconbtn{padding:7px;border:1px solid var(--line);border-radius:8px;background:var(--panel)}.welcome{display:flex;justify-content:space-between;align-items:center;margin:33px 0 27px}.eyebrow{font-size:10px;letter-spacing:2px;color:var(--muted);margin-bottom:10px}h1{font-size:27px;letter-spacing:.5px;margin:0 0 10px;font-weight:600}h1 span{font-family:Georgia;font-size:25px;color:#c3a977}p{margin:0;color:var(--muted);font-size:12px;line-height:1.8}.welcome-right{display:flex;gap:12px;align-items:center}.demo-tag{font-size:10px;padding:6px 9px;background:var(--quote);border:1px solid var(--line);border-radius:5px;color:var(--muted)}.primary{background:#356ce5;color:white;padding:11px 16px;border-radius:7px;font-size:12px}.primary svg{width:15px;height:15px;margin-right:6px}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-bottom:23px}.card{background:var(--panel);border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow)}.stat{padding:21px 23px}.stat-label{display:flex;justify-content:space-between;align-items:center;color:var(--muted);font-size:12px}.stat-label svg{width:17px;height:17px;color:#9aa8bf}.stat-value{font-family:Georgia,serif;font-size:34px;letter-spacing:-1px;margin:14px 0 12px}.stat-value small{font-family:"PingFang SC",sans-serif;font-size:11px;color:var(--muted);letter-spacing:0;margin-left:5px}.stat-foot{font-size:10px;color:var(--muted)}.stat-foot b{color:var(--green);font-weight:500;margin-right:7px}.columns{display:grid;grid-template-columns:minmax(0,1fr) 296px;gap:23px}.section-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px}.section-head h2{font-size:15px;font-weight:600;margin:0}.section-head h2 small{font-weight:400;color:var(--muted);font-size:10px;margin-left:10px}.text-button{font-size:11px;color:var(--muted);padding:3px}.text-button:hover{color:var(--accent)}.trend{padding:24px 25px;margin-bottom:23px}.segmented{background:var(--bg);padding:3px;display:flex;border-radius:6px}.segmented button{font-size:10px;padding:5px 12px;color:var(--muted);border-radius:4px}.segmented button.active{background:var(--panel);coloLine truncated
+/* 阅读目标与内容页：与既有主题变量共用色彩。 */
+:root{--muted:#717b8b}[data-theme=dark]{--muted:#a2adbf}h3{font-size:14px;margin:0}button:disabled{opacity:.45;cursor:not-allowed}.demo-banner{display:flex;justify-content:space-between;color:var(--muted);font-size:10px;margin-top:18px}.welcome{margin-top:26px}.page-actions{display:flex;align-items:center;gap:10px}.secondary{padding:10px 15px;border:1px solid var(--line);background:var(--panel);border-radius:7px;font-size:12px}.pill{display:inline-block;padding:5px 8px;font-size:10px;border-radius:5px;background:var(--soft);color:var(--accent);white-space:nowrap}.pill.green{background:#6a9a8219;color:var(--green)}.pill.amber{background:#c3923919;color:#b78a3f}.hint{font-size:11px;color:var(--muted);line-height:1.8}.panel{padding:24px}.panel+.panel{margin-top:20px}.toolbar{display:flex;gap:10px;align-items:center;justify-content:space-between;flex-wrap:wrap;margin:0 0 22px}.toolbar .tabs{margin:0;flex-wrap:wrap}.toolbar input,.toolbar select,.field input,select{border:1px solid var(--line);border-radius:7px;padding:10px 12px;background:var(--panel);color:var(--text);font:inherit;font-size:12px}.toolbar select{max-width:100%}.field{display:flex;flex-direction:column;gap:8px;font-size:12px;margin-bottom:18px}.field input{width:100%;background:var(--bg)}.date-fields{display:grid;grid-template-columns:1fr 1fr;gap:16px}.metrics-row{display:flex;gap:24px;padding:18px 0;margin-bottom:10px;color:var(--muted);font-size:11px}.metrics-row strong{font-family:Georgia;font-size:28px;color:var(--text);margin-right:6px;font-weight:400}.goals-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.goal-card{padding:25px;position:relative;overflow:hidden}.goal-card:before{content:'';position:absolute;inset:0 auto 0 0;width:3px;background:var(--green)}.goal-card h3{font-size:19px;margin:17px 0 8px;word-break:break-word}.goal-card .section-head{margin-bottom:0}.goal-date{font-size:11px;color:var(--muted)}.cover-stack{display:flex;gap:0;margin:24px 0 20px;height:92px;padding-left:4px}.mini-cover{width:66px;height:92px;padding:10px 8px;border-radius:2px 4px 4px 2px;box-shadow:4px 5px 10px #0002;display:flex;flex-direction:column;flex-shrink:0;position:relative;overflow:hidden;border-left:3px solid #0002}.cover-stack .mini-cover{margin-left:-4px;transform:rotate(-3deg);transform-origin:bottom}.cover-stack .mini-cover:nth-child(2n){transform:rotate(4deg)}.mini-cover b{font-family:'Songti SC',serif;font-size:12px;position:relative;z-index:1;line-height:1.5}.mini-cover small{font-size:6px;position:relative;margin-top:auto}.stack-more{align-self:center;margin-left:18px;color:var(--muted);font-size:12px}.goal-progress{display:flex;justify-content:space-between;align-items:center;font-size:11px;color:var(--muted);margin:12px 0 9px}.goal-progress strong{font-size:22px;color:var(--text);font-family:Georgia;font-weight:400}.goal-card .progress{height:5px;margin:0 0 19px}.goal-card .progress i{background:var(--green)}.goal-card-footer{display:flex;align-items:center;justify-content:space-between;border-top:1px solid var(--line);padding-top:16px}.goal-card-footer small{font-size:10px;color:var(--muted)}.goal-card-footer button{font-size:11px;color:var(--accent)}.goal-intro{display:grid;grid-template-columns:1fr auto;gap:28px;background:var(--quote);padding:26px 30px;margin-bottom:24px;border:1px solid var(--line);border-radius:12px}.goal-intro h2{font-family:'Songti SC',serif;font-size:23px;font-weight:500;margin:0 0 10px}.goal-intro p{max-width:500px}.goal-intro .symbol{font-family:Georgia;font-size:65px;align-self:center;color:#819583}.goal-summary-row{display:block;text-align:left;width:100%;padding:16px 0;border-top:1px solid var(--line)}.goal-summary-row strong{font-size:12px;font-weight:500}.goal-summary-row small{display:block;margin-top:7px;color:var(--muted);font-size:10px}.goal-summary-row .progress{margin-top:10px}.list-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.list-card{padding:21px;display:block;text-align:left;transition:transform .2s}.list-card:hover{transform:translateY(-3px)}.list-art{height:117px;display:flex;align-items:center;justify-content:center;background:var(--quote);border-radius:7px;margin-bottom:18px}.list-art .mini-cover:nth-child(2){transform:translateY(-5px);margin:0 -4px;z-index:1}.list-card h3{font-size:15px;margin-bottom:8px}.list-card p{font-size:11px}.list-card>small{display:block;color:var(--muted);font-size:10px;margin-top:15px}.full-books{grid-template-columns:repeat(5,minmax(0,1fr));gap:26px}.full-books .cover{height:168px;width:118px}.row-list{display:flex;flex-direction:column}.book-row{display:flex;align-items:center;gap:15px;padding:14px 0;border-bottom:1px solid var(--line)}.book-row:last-child{border:0}.book-row .mini-cover{width:42px;height:58px;padding:5px}.book-row .mini-cover b{font-size:8px}.book-row .mini-cover small{display:none}.book-row-text{flex:1;min-width:0}.book-row-text b{font-size:12px;font-weight:500}.book-row-text p{font-size:10pLine truncated
+@media(max-width:1200px){.full-books{grid-template-columns:repeat(4,minmax(0,1fr))}.list-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.insight-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:900px){.goals-grid{grid-template-columns:1fr}.columns>.rightcol{display:flex}.notebook-grid{grid-template-columns:1fr}.notebook-menu{display:flex;overflow:auto}.notebook-menu button{min-width:160px}.full-books{grid-template-columns:repeat(3,minmax(0,1fr))}.insight-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.sidebar .nav{gap:9px}.welcome{align-items:flex-start;gap:15px}.welcome h1{line-height:1.4}.welcome .primary{white-space:nowrap}.goal-intro{padding:22px}.demo-banner span:last-child{display:none}}@media(max-width:600px){.full-books{grid-template-columns:repeat(2,minmax(0,1fr))}.list-grid,.insight-grid{grid-template-columns:1fr}.goal-intro{grid-template-columns:1fr}.goal-intro .symbol{display:none}.goal-card{padding:20px}.welcome{flex-direction:column}.welcome .page-actions{align-self:flex-end}.panel{padding:18px}.date-fields{grid-template-columns:1fr;gap:0}.detail-body>.cover{width:95px;flex-shrink:0}.detail-body{gap:15px}.detail-info h3{font-size:18px}.book-details-grid{grid-template-columns:1fr}.toolbar input{width:100%}.metrics-row{gap:16px;flex-wrap:wrap}.metrics-row strong{font-size:23px}.goal-intro h2{font-size:20px}.cover-stack .mini-cover{width:57px}.stack-more{font-size:10px;margin-left:10px}.demo-banner{font-size:9px}.goal-card h3{font-size:17px}dialog{padding:20px}.editor-footer{gap:10px}.book-row{gap:9px}.book-row-text b{font-size:11px}}
+.compact-value{font-family:Georgia,'PingFang SC',sans-serif;font-size:25px;line-height:1.5;letter-spacing:-.5px}.stat-foot{line-height:1.7}.insight-detail .insight-grid{margin-top:0}.sidebar .nav button[aria-current=page]{color:var(--accent)}
+@media(max-width:600px){.compact-value{font-size:20px}.list-art .mini-cover{width:56px}.full-books .cover{width:105px;height:159px}.goal-card .section-head{gap:10px}.book-row .mini-cover{display:none}.detail-tabs{gap:16px}.date-fields input{min-height:40px}.detail-info .primary{font-size:11px;padding:9px}}
+.mini-cover.c2,.mini-cover.c3{color:#fff5df}
+.export-preview{width:100%;height:320px;margin-top:20px;border:1px solid var(--line);border-radius:8px;padding:18px;background:var(--bg);color:var(--text);font:12px/1.9 'PingFang SC',sans-serif;resize:vertical}