M2: 主题系统（sablog经典+modern简约）+ 前台全部页面 + 老 URL 301 兼容 + markdown 双份导入

app/Blog/Controllers/PostController.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace App\Blog\Controllers;
+
+use App\Blog\Services\PostContentRenderer;
+use App\Models\Post;
+
+class PostController extends Controller
+{
+    public function __construct(private PostContentRenderer $renderer)
+    {
+    }
+
+    public function show(string $slug)
+    {
+        $post = Post::query()
+            ->where('slug', $slug)
+            ->orWhere('id', (int) $slug)
+            ->first();
+
+        abort_unless($post && $post->status === 'published', 404);
+
+        $this->ensureReadable($post);
+
+        $post->increment('views');
+
+        $comments = $post->comments()
+            ->where('status', 'published')
+            ->latest('created_at')
+            ->paginate(20);
+
+        $contentHtml = $this->renderer->render($post);
+
+        return theme_view('show', compact('post', 'comments', 'contentHtml'));
+    }
+
+    private function ensureReadable(Post $post): void
+    {
+        if (! $post->read_password) {
+            return;
+        }
+
+        $granted = session()->get("post_read_password.{$post->id}") === $post->read_password;
+        $isEditor = auth()->check() && (auth()->user()->isAdmin() || auth()->user()->hasRole('editor'));
+
+        if (! $granted && ! $isEditor) {
+            abort(403, '该文章需要访问密码');
+        }
+    }
+}