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

app/Blog/Support/PluginManager.php

@@ -8,6 +8,7 @@ namespace App\Blog\Support;
 use App\Models\PluginRecord;
 use Illuminate\Support\Facades\File;
 use Illuminate\Support\Str;
+use RuntimeException;
 
 class PluginManager
 {
@@ -54,6 +55,25 @@ class PluginManager
 
             [$vendor, $name] = array_pad(explode('.', $basename), 2, $basename);
 
+            $requires = $manifest['requires'] ?? [];
+            $dependencies = [];
+            $dependencyErrors = [];
+
+            foreach ($requires as $req) {
+                $installed = $this->exists($req);
+                $enabled = $installed && $this->isEnabled($req);
+                $dependencies[] = [
+                    'key' => $req,
+                    'title' => $this->manifest($req)['title'] ?? $req,
+                    'ok' => $enabled,
+                    'reason' => $installed ? ($enabled ? '' : '未启用') : '未安装',
+                ];
+
+                if (! $enabled) {
+                    $dependencyErrors[] = $req;
+                }
+            }
+
             $plugins[$basename] = [
                 'key' => $basename,
                 'vendor' => $vendor,
@@ -63,6 +83,9 @@ class PluginManager
                 'description' => $manifest['description'] ?? '',
                 'author' => $manifest['author'] ?? '',
                 'enabled' => $this->isEnabled($basename),
+                'requires' => $requires,
+                'dependencies' => $dependencies,
+                'dependency_errors' => $dependencyErrors,
             ];
         }
 
@@ -84,8 +107,53 @@ class PluginManager
         return in_array($plugin, config('plugins.enabled', []), true);
     }
 
+    public function requires(string $plugin): array
+    {
+        return $this->manifest($plugin)['requires'] ?? [];
+    }
+
+    /**
+     * 依赖未满足的问题列表（空数组 = 依赖完好）。
+     */
+    public function dependencyProblems(string $plugin): array
+    {
+        $problems = [];
+
+        foreach ($this->requires($plugin) as $req) {
+            if (! $this->exists($req)) {
+                $problems[] = "缺少依赖插件：{$req}（未安装）";
+            } elseif (! $this->isEnabled($req)) {
+                $problems[] = '依赖插件未启用：'.$req.'（'.$this->manifest($req)['title'].'）';
+            }
+        }
+
+        return $problems;
+    }
+
+    /**
+     * 已启用且依赖本插件的插件列表。
+     */
+    public function dependents(string $plugin): array
+    {
+        $dependents = [];
+
+        foreach ($this->all() as $key => $p) {
+            if ($p['enabled'] && in_array($plugin, $p['requires'] ?? [], true)) {
+                $dependents[] = $key;
+            }
+        }
+
+        return $dependents;
+    }
+
     public function enable(string $plugin): void
     {
+        $problems = $this->dependencyProblems($plugin);
+
+        if ($problems) {
+            throw new RuntimeException('无法启用 '.$plugin.'：'.implode('；', $problems));
+        }
+
         [$vendor, $name] = array_pad(explode('.', $plugin), 2, $plugin);
         PluginRecord::query()->updateOrCreate(
             ['vendor' => $vendor, 'name' => $name],
@@ -95,6 +163,12 @@ class PluginManager
 
     public function disable(string $plugin): void
     {
+        $dependents = $this->dependents($plugin);
+
+        if ($dependents) {
+            throw new RuntimeException('无法停用 '.$plugin.'：以下已启用插件依赖它：'.implode('、', $dependents).'。请先停用这些插件。');
+        }
+
         [$vendor, $name] = array_pad(explode('.', $plugin), 2, $plugin);
         PluginRecord::query()->updateOrCreate(
             ['vendor' => $vendor, 'name' => $name],