fix: remove Google Fonts dependency + lazy-load page scripts

- CSS: drop @import fonts.googleapis (blocked by CSP style-src,
  unreachable in CN) - use system font stack with YaHei fallback
- index.html: remove all 26 js/pages/*.js tags - core 4 scripts only
- app.js: route-based lazy loading - PAGE_SCRIPTS map, loadScript
  with cache, async route() loads page scripts before render
- cross-deps: home->ticket-create, reset defined in forgot.js

public/js/app.js

@@ -97,12 +97,68 @@ const App = {
   closeModal() { document.getElementById('modal-overlay').classList.add('hidden'); },
   navigate(page, param) { location.hash = `#/${page}` + (param ? `/${param}` : ''); },
 
-  route() {
+  // ===== 页面脚本懒加载: 按路由动态注入, 避免全量下发 =====
+  _scriptCache: {},
+  // 路由 → 依赖脚本(不带 .js 后缀); home 依赖 ticket-create(首页内嵌提交表单), reset 定义于 forgot.js
+  PAGE_SCRIPTS: {
+    home: ['home', 'ticket-create'],
+    install: ['install'],
+    login: ['login'],
+    register: ['register'],
+    forgot: ['forgot'],
+    reset: ['forgot'],
+    verify: ['verify'],
+    dashboard: ['dashboard'],
+    unclaimed: ['unclaimed'],
+    tickets: ['tickets', 'ticket-create'],
+    ticket: ['ticket-detail'],
+    tracking: ['tracking'],
+    users: ['users'],
+    notifications: ['notifications'],
+    'external-api': ['external-api'],
+    'external-api-docs': ['external-api-docs'],
+    sources: ['sources'],
+    templates: ['templates'],
+    settings: ['settings-page'],
+    export: ['export-page'],
+    polls: ['polls'],
+    features: ['features'],
+    feature: ['feature-detail'],
+    servers: ['servers'],
+    bans: ['bans'],
+    logs: ['logs'],
+  },
+  loadScript(src) {
+    if (this._scriptCache[src]) return this._scriptCache[src];
+    const p = new Promise((resolve, reject) => {
+      const s = document.createElement('script');
+      s.src = src;
+      s.onload = () => resolve();
+      s.onerror = () => { delete this._scriptCache[src]; reject(new Error('脚本加载失败: ' + src)); };
+      document.head.appendChild(s);
+    });
+    this._scriptCache[src] = p;
+    return p;
+  },
+  async loadPageScripts(page) {
+    const files = this.PAGE_SCRIPTS[page] || [page];
+    for (const f of files) await this.loadScript(`js/pages/${f}.js`);
+  },
+
+  async route() {
     const hash = location.hash || '#/home';
     const parts = hash.replace('#/', '').split('/');
     const page = parts[0];
     const param = parts.slice(1).join('/');
 
+    // 先加载当前路由所需页面脚本, 再渲染
+    try { await this.loadPageScripts(page); }
+    catch (e) {
+      console.error('页面脚本加载失败:', e.message);
+      document.getElementById('page-content').innerHTML = `<div class="card"><div class="card-b" style="text-align:center;color:var(--d)">页面资源加载失败, 请刷新重试</div></div>`;
+      return;
+    }
+
     if (page === 'verify') {
       this.showPublic('verify');
       return;