fix: 修复 Space 模板缺少 formatCount/str 函数导致的启动 panic

- 在 theme/loader.go FuncMap 中添加 formatCount 和 str 函数
- formatCount 将 int64 格式化为中文计数（如 2.5万）
- 控制器 ActiveFolderID 改为 uint 类型，避免模板中 str 类型比较
- 控制器传递 ActiveFolder 对象，移除模板内查找逻辑
- 清理旧模板替换残留的孤儿 HTML/SVG 代码

templates/MetaLab-2026/html/space/index.html

@@ -351,7 +351,7 @@
                 {{if .FoldersResult}}
                 {{range $f := .FoldersResult.Folders}}
                 <a href="/space/{{$.SpaceUser.ID}}?tab=collections&folder={{$f.ID}}"
-                   class="space-sidebar-link{{if eq (str $.ActiveFolderID) (str $f.ID)}} active{{end}}"
+                   class="space-sidebar-link{{if eq $.ActiveFolderID $f.ID}} active{{end}}"
                    data-folder-id="{{$f.ID}}">
                     <svg class="space-sidebar-icon" viewBox="0 0 24 24" width="16" height="16"><path fill="currentColor" d="M17 3H7c-1.1 0-2 .9-2 2v16l7-3 7 3V5c0-1.1-.9-2-2-2zm0 15l-5-2.18L7 18V5h10v13z"/></svg>
                     {{$f.Name}}
@@ -366,32 +366,21 @@
         <main class="space-main">
             {{if .FoldersResult}}
             {{if gt (len .FoldersResult.Folders) 0}}
-                {{/* 找到当前激活的收藏夹 */}}
-                {{$activeFolder := ""}}
-                {{range $f := .FoldersResult.Folders}}
-                    {{if eq (str $.ActiveFolderID) (str $f.ID)}}
-                        {{$activeFolder = $f}}
-                    {{end}}
-                {{end}}
-
-                {{if $activeFolder}}
+            {{if .ActiveFolder}}
                 <!-- 收藏夹头信息 -->
                 <div class="collection-header">
                     <div class="collection-cover">
-                        {{if $activeFolder.Description}}
                         <div class="collection-cover-placeholder"></div>
-                        {{end}}
                     </div>
                     <div class="collection-info-row">
                         <div>
-                            <h1 class="collection-name">{{$activeFolder.Name}}</h1>
+                            <h1 class="collection-name">{{.ActiveFolder.Name}}</h1>
                             <p class="collection-meta">
-                                {{if $activeFolder.IsPublic}}公开{{else}}私密{{end}}
-                                · 视频数 {{.FolderItems.Total}}
+                                {{if .ActiveFolder.IsPublic}}公开{{else}}私密{{end}}
+                                · 文章数 {{.FolderItems.Total}}
                             </p>
                         </div>
                         <div class="collection-actions">
-                            <button class="space-action-btn primary small">播放全部</button>
                             <button class="space-action-btn outline small">批量操作</button>
                         </div>
                     </div>
@@ -406,14 +395,8 @@
                     </div>
                     <div class="collection-filter">
                         <select class="filter-select">
-                            <option>当前</option>
+                            <option>全部</option>
                         </select>
-                        <div class="filter-search">
-                            <input type="text" placeholder="请输入关键词" class="filter-search-input">
-                            <button class="filter-search-btn">
-                                <svg viewBox="0 0 24 24" width="16" height="16"><path fill="currentColor" d="M15.5 14h-.79l-.28-.27C15.41 12.59 16 11.11 16 9.5 16 5.91 13.09 3 9.5 3S3 5.91 3 9.5 5.91 16 9.5 16c1.61 0 3.09-.59 4.23-1.57l.27.28v.79l5 4.99L20.49 19l-4.99-5zm-6 0C7.01 14 5 11.99 5 9.5S7.01 5 9.5 5 14 7.01 14 9.5 11.99 14 9.5 14z"/></svg>
-                            </button>
-                        </div>
                     </div>
                 </div>