feat: 插件依赖强制校验 + 文章后台表单/表格注入 hook

- PluginManager: requires 依赖链校验（enable 需依赖已启用，disable 阻止有启用依赖者的插件，boot 跳过依赖未满足插件），all() 输出依赖状态供后台展示
- Plugins 页：卡片显示依赖链徽章，依赖未满足时禁用启用按钮，启停失败弹错误通知
- PostResource: form()/table() 增加 filament.post_form / filament.post_table 注入点
- membership 插件：注入「付费设置」Section（meta.price 单篇价格 + meta.members_only 会员专享）与表格价格/会员列

resources/views/filament/pages/plugins.blade.php

@@ -17,11 +17,24 @@
                         <p class="mt-1 flex-1 text-sm text-gray-500 dark:text-gray-400">{{ $plugin['description'] }}</p>
                         <p class="mt-2 text-xs text-gray-400">v{{ $plugin['version'] }} · {{ $plugin['vendor'] }}.{{ $plugin['name'] }}</p>
 
+                        @if(! empty($plugin['dependencies']))
+                            <div class="mt-2 flex flex-wrap items-center gap-1">
+                                <span class="text-xs text-gray-400">依赖：</span>
+                                @foreach($plugin['dependencies'] as $dep)
+                                    <x-filament::badge :color="$dep['ok'] ? 'success' : 'danger'" size="xs">
+                                        {{ $dep['title'] }}@if(! $dep['ok'])（{{ $dep['reason'] }}）@endif
+                                    </x-filament::badge>
+                                @endforeach
+                            </div>
+                        @endif
+
                         <div class="mt-4 flex flex-wrap gap-2">
                             @if($plugin['enabled'])
                                 <x-filament::button size="sm" color="gray" wire:click="disablePlugin('{{ $plugin['key'] }}')">停用</x-filament::button>
-                            @else
+                            @elseif(empty($plugin['dependency_errors']))
                                 <x-filament::button size="sm" color="success" wire:click="enablePlugin('{{ $plugin['key'] }}')">启用</x-filament::button>
+                            @else
+                                <x-filament::badge color="warning">依赖未满足，无法启用</x-filament::badge>
                             @endif
                             @if(! in_array($plugin['key'], config('plugins.enabled', []), true))
                                 <x-filament::button size="sm" color="danger" wire:click="uninstallPlugin('{{ $plugin['key'] }}')" wire:confirm="确定卸载该插件？">卸载</x-filament::button>