feat: 实现系统设置管理界面

- SystemSettingResource: Filament 资源类
  - 使用 Tabs 组件按 group 分组显示配置
  - 使用 KeyValue 组件编辑 JSON 配置
  - 支持筛选、排序、搜索功能
  - 配置彩色徽章显示分组

- ManageSystemSettings: 系统设置管理页面
  - 按配置类型分组（嵌入模型/分块参数/系统配置/搜索配置）
  - 完整的表单验证规则
  - 保存和重置功能
  - 集成 SystemSettingService

- 创建对应的 Blade 视图和页面类

app/Filament/Resources/SystemSettingResource/Pages/CreateSystemSetting.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace App\Filament\Resources\SystemSettingResource\Pages;
+
+use App\Filament\Resources\SystemSettingResource;
+use Filament\Resources\Pages\CreateRecord;
+
+class CreateSystemSetting extends CreateRecord
+{
+    protected static string $resource = SystemSettingResource::class;
+
+    protected function getRedirectUrl(): string
+    {
+        return $this->getResource()::getUrl('index');
+    }
+}

app/Filament/Resources/SystemSettingResource/Pages/EditSystemSetting.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace App\Filament\Resources\SystemSettingResource\Pages;
+
+use App\Filament\Resources\SystemSettingResource;
+use Filament\Actions;
+use Filament\Resources\Pages\EditRecord;
+
+class EditSystemSetting extends EditRecord
+{
+    protected static string $resource = SystemSettingResource::class;
+
+    protected function getHeaderActions(): array
+    {
+        return [
+            Actions\ViewAction::make()
+                ->label('查看'),
+            Actions\DeleteAction::make()
+                ->label('删除'),
+        ];
+    }
+
+    protected function getRedirectUrl(): string
+    {
+        return $this->getResource()::getUrl('index');
+    }
+}

app/Filament/Resources/SystemSettingResource/Pages/ListSystemSettings.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace App\Filament\Resources\SystemSettingResource\Pages;
+
+use App\Filament\Resources\SystemSettingResource;
+use Filament\Actions;
+use Filament\Resources\Pages\ListRecords;
+
+class ListSystemSettings extends ListRecords
+{
+    protected static string $resource = SystemSettingResource::class;
+
+    protected function getHeaderActions(): array
+    {
+        return [
+            Actions\CreateAction::make()
+                ->label('新建配置'),
+        ];
+    }
+}

app/Filament/Resources/SystemSettingResource/Pages/ViewSystemSetting.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace App\Filament\Resources\SystemSettingResource\Pages;
+
+use App\Filament\Resources\SystemSettingResource;
+use Filament\Actions;
+use Filament\Resources\Pages\ViewRecord;
+
+class ViewSystemSetting extends ViewRecord
+{
+    protected static string $resource = SystemSettingResource::class;
+
+    protected function getHeaderActions(): array
+    {
+        return [
+            Actions\EditAction::make()
+                ->label('编辑'),
+        ];
+    }
+}