feat: 文章/分类/评论关联细节完善

- 文章列表：会员插件注入「付费」徽章列（会员/付费¥xx，停插件即消失）
- 分类：真实文章数（withCount）、名称点击跳文章列表并按分类筛选（ListPosts booted 预置筛选）
- 分类：新增封面（medialibrary）+ 介绍（description 字段/表单）；前台分类页顶部展示介绍区；SEO description + BreadcrumbList 结构化数据（GEO）
- 文章编辑：MarkdownEditor 内容区加大（26rem）；文章编辑页新增「评论」关系管理页（可审/拒）
- 评论列表：文章列带摘要
- 三套主题补 .category-intro 样式
- 测试更新（付费徽章列）

app/Filament/Resources/Categories/Schemas/CategoryForm.php

@@ -4,7 +4,11 @@ declare(strict_types=1);
 
 namespace App\Filament\Resources\Categories\Schemas;
 
+use App\Support\MediaDisk;
+use Filament\Forms\Components\SpatieMediaLibraryFileUpload;
+use Filament\Forms\Components\Textarea;
 use Filament\Forms\Components\TextInput;
+use Filament\Schemas\Components\Section;
 use Filament\Schemas\Schema;
 
 class CategoryForm
@@ -13,23 +17,39 @@ class CategoryForm
     {
         return $schema
             ->components([
-                TextInput::make('name')
-                    ->label(__('category.name'))
-                    ->required(),
-                TextInput::make('slug')
-                    ->label(__('category.slug'))
-                    ->helperText('留空自动生成'),
-                TextInput::make('display_order')
-                    ->label(__('category.display_order'))
-                    ->required()
-                    ->numeric()
-                    ->default(0),
-                TextInput::make('post_count')
-                    ->label(__('category.post_count'))
-                    ->required()
-                    ->numeric()
-                    ->default(0)
-                    ->disabled(),
+                Section::make('基本信息')
+                    ->columns(2)
+                    ->schema([
+                        TextInput::make('name')
+                            ->label(__('category.name'))
+                            ->required(),
+                        TextInput::make('slug')
+                            ->label(__('category.slug'))
+                            ->helperText('留空自动生成'),
+                        TextInput::make('display_order')
+                            ->label(__('category.display_order'))
+                            ->required()
+                            ->numeric()
+                            ->default(0),
+                        TextInput::make('post_count')
+                            ->label('文章数（自动统计）')
+                            ->numeric()
+                            ->disabled(),
+                        Textarea::make('description')
+                            ->label('分类介绍')
+                            ->helperText('显示在分类列表页顶部，也用于 SEO description')
+                            ->rows(4)
+                            ->columnSpanFull(),
+                    ]),
+                Section::make('封面')
+                    ->schema([
+                        SpatieMediaLibraryFileUpload::make('cover')
+                            ->label('封面图')
+                            ->collection('cover')
+                            ->image()
+                            ->imageEditor()
+                            ->disk(MediaDisk::name()),
+                    ]),
             ]);
     }
 }

app/Filament/Resources/Categories/Tables/CategoriesTable.php

@@ -9,16 +9,20 @@ use Filament\Actions\DeleteBulkAction;
 use Filament\Actions\EditAction;
 use Filament\Tables\Columns\TextColumn;
 use Filament\Tables\Table;
+use Illuminate\Support\Str;
 
 class CategoriesTable
 {
     public static function configure(Table $table): Table
     {
         return $table
+            ->modifyQueryUsing(fn ($query) => $query->withCount('posts'))
             ->columns([
                 TextColumn::make('name')
                     ->label(__('category.name'))
-                    ->searchable(),
+                    ->searchable()
+                    ->url(fn ($record) => route('filament.admin.resources.posts.index').'?category_id='.$record->id)
+                    ->description(fn ($record) => $record->description ? Str::limit($record->description, 40) : null),
                 TextColumn::make('slug')
                     ->label(__('category.slug'))
                     ->searchable(),
@@ -26,8 +30,8 @@ class CategoriesTable
                     ->label(__('category.display_order'))
                     ->numeric()
                     ->sortable(),
-                TextColumn::make('post_count')
-                    ->label(__('category.post_count'))
+                TextColumn::make('posts_count')
+                    ->label('文章数')
                     ->numeric()
                     ->sortable(),
                 TextColumn::make('created_at')