feat(阶段四): 实现 SOP 模板状态管理功能

- 创建发布 Action（PublishSopTemplateAction）
- 创建归档 Action（ArchiveSopTemplateAction）
- 创建预览 Action（PreviewSopTemplateAction）
- 发布前验证模板是否有步骤
- 发布时自动创建版本快照
- 预览模式显示完整模板内容

app/Filament/Actions/PreviewSopTemplateAction.php

@@ -0,0 +1,90 @@
+<?php
+
+namespace App\Filament\Actions;
+
+use App\Models\SopTemplate;
+use Filament\Actions\Action;
+use Filament\Infolists;
+use Filament\Infolists\Infolist;
+
+class PreviewSopTemplateAction extends Action
+{
+    public static function getDefaultName(): ?string
+    {
+        return 'preview';
+    }
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->label('预览模板');
+
+        $this->icon('heroicon-o-eye');
+
+        $this->color('info');
+
+        $this->modalHeading('SOP 模板预览');
+
+        $this->modalWidth('7xl');
+
+        $this->modalSubmitAction(false);
+
+        $this->modalCancelActionLabel('关闭');
+
+        $this->infolist(function (SopTemplate $record): Infolist {
+            return Infolist::make()
+                ->record($record)
+                ->schema([
+                    Infolists\Components\Section::make('模板信息')
+                        ->schema([
+                            Infolists\Components\TextEntry::make('name')
+                                ->label('模板名称')
+                                ->size(Infolists\Components\TextEntry\TextEntrySize::Large)
+                                ->weight('bold'),
+                            
+                            Infolists\Components\TextEntry::make('description')
+                                ->label('模板描述')
+                                ->columnSpanFull(),
+                            
+                            Infolists\Components\TextEntry::make('category')
+                                ->label('分类')
+                                ->badge(),
+                            
+                            Infolists\Components\TextEntry::make('version')
+                                ->label('版本'),
+                        ])
+                        ->columns(2),
+
+                    Infolists\Components\Section::make('操作步骤')
+                        ->schema([
+                            Infolists\Components\RepeatableEntry::make('steps')
+                                ->label('')
+                                ->schema([
+                                    Infolists\Components\TextEntry::make('step_number')
+                                        ->label('步骤')
+                                        ->badge()
+                                        ->color('primary'),
+                                    
+                                    Infolists\Components\TextEntry::make('title')
+                                        ->label('标题')
+                                        ->weight('bold'),
+                                    
+                                    Infolists\Components\TextEntry::make('content')
+                                        ->label('内容')
+                                        ->html()
+                                        ->columnSpanFull(),
+                                    
+                                    Infolists\Components\TextEntry::make('is_required')
+                                        ->label('必需')
+                                        ->badge()
+                                        ->formatStateUsing(fn (bool $state): string => $state ? '是' : '否')
+                                        ->color(fn (bool $state): string => $state ? 'success' : 'gray'),
+                                ])
+                                ->columns(3)
+                                ->contained(false),
+                        ]),
+                ]);
+        });
+    }
+}