feat: dashboard manifest supports 'supported_games' field, frontend filters by selected game

- DashboardTheme model adds supported_games (default: 'all')
- Built-in dashboards declare game compatibility:
  speedometer/tachometer/gear_indicator -> all
  lap_timer -> forza_horizon_5,forza_horizon_4,forza_motorsport,f1_24
- Dashboard browser filters themes by selected game
- Card shows '全' (all) or '限' (limited) badge
- Updated DASHBOARD_DEV.md with supported_games spec

static/js/pages/dashboard.js

@@ -1,12 +1,15 @@
 const PageDashboard = {
     _el: null,
     _currentCategory: 'all',
+    _selectedGameId: null,
 
     init() {
         this._el = document.getElementById('page-dashboard');
     },
 
     async render() {
+        const cfg = await API.getConfig();
+        this._selectedGameId = cfg.selected_game_id;
         this._el.innerHTML = this._template();
         await this._loadCategories();
         await this._loadThemes();
@@ -44,14 +47,18 @@ const PageDashboard = {
         gridEl.innerHTML = '<div style="text-align:center;padding:40px;color:var(--text-tertiary);">加载中...</div>';
 
         try {
-            const themes = await API.getDashboards(this._currentCategory);
+            let themes = await API.getDashboards(this._currentCategory);
             if (!themes || themes.length === 0) {
-                gridEl.innerHTML = `
-                <div class="empty-state" style="grid-column:1/-1;">
-                    <svg viewBox="0 0 24 24" width="64" height="64"><path d="M12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm0 18c-4.41 0-8-3.59-8-8s3.59-8 8-8 8 3.59 8 8-3.59 8-8 8zm0-12c-2.21 0-4 1.79-4 4s1.79 4 4 4 4-1.79 4-4-1.79-4-4-4z" fill="currentColor"/></svg>
-                    <h4>暂无仪表盘主题</h4>
-                    <p>创建或导入你的第一个仪表盘主题</p>
-                </div>`;
+                gridEl.innerHTML = this._emptyHtml();
+                return;
+            }
+
+            if (this._selectedGameId) {
+                themes = themes.filter(t => this._isGameSupported(t));
+            }
+
+            if (themes.length === 0) {
+                gridEl.innerHTML = this._emptyHtml('当前游戏没有兼容的仪表盘');
                 return;
             }
 
@@ -62,6 +69,22 @@ const PageDashboard = {
         }
     },
 
+    _isGameSupported(theme) {
+        const supported = theme.supported_games || 'all';
+        if (supported === 'all') return true;
+        const ids = supported.split(',').map(s => s.trim());
+        return ids.includes(this._selectedGameId);
+    },
+
+    _emptyHtml(msg) {
+        return `
+        <div class="empty-state" style="grid-column:1/-1;">
+            <svg viewBox="0 0 24 24" width="64" height="64"><path d="M12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm0 18c-4.41 0-8-3.59-8-8s3.59-8 8-8 8 3.59 8 8-3.59 8-8 8zm0-12c-2.21 0-4 1.79-4 4s1.79 4 4 4 4-1.79 4-4-1.79-4-4-4z" fill="currentColor"/></svg>
+            <h4>${msg || '暂无仪表盘主题'}</h4>
+            <p>创建或导入你的仪表盘主题</p>
+        </div>`;
+    },
+
     _bindEvents() {
         const categoryList = document.getElementById('dash-category-list');
         if (categoryList) {
@@ -133,6 +156,10 @@ const PageDashboard = {
     _themeCardHtml(theme) {
         const icon = theme.icon || '📊';
         const aspect = theme.aspect_ratio || 'auto';
+        const supported = theme.supported_games || 'all';
+        const isAll = supported === 'all';
+        const compatLabel = isAll ? '全' : '限';
+        const compatClass = isAll ? 'badge-info' : 'badge-warning';
         return `
         <div class="glass-card theme-card" data-theme-id="${theme.id}">
             <div class="theme-card-preview">${icon}</div>
@@ -144,7 +171,7 @@ const PageDashboard = {
                 </div>
                 <div class="theme-card-meta" style="margin-top:4px;">
                     <span>${theme.author || ''}</span>
-                    <span class="badge ${theme.is_builtin ? 'badge-info' : 'badge-success'}">${theme.is_builtin ? '内置' : '自定义'}</span>
+                    <span class="badge ${compatClass}">${compatLabel}</span>
                 </div>
             </div>
         </div>`;