feat(blog): add admin endpoint to list all blog posts with status filtering

docs/api/blog.md

@@ -62,6 +62,25 @@ List published blog posts.
 
 ---
 
+## GET `/api/v1/admin/blogs`
+
+List blog posts of **all** statuses for the admin panel. The public `GET /api/v1/blogs` only returns `published` posts, so the admin panel must use this endpoint to see drafts and archived posts.
+
+**Permission:** `ROLE_ADMIN`
+
+### Query Parameters
+| Param | Type | Required | Default | Description |
+|-------|------|----------|---------|-------------|
+| `page` | integer | ❌ | 1 | Page number |
+| `limit` | integer | ❌ | 20 (max 50) | Items per page |
+| `status` | string | ❌ | — | Filter by `draft` / `published` / `archived`. Omit for all. |
+| `search` | string | ❌ | — | Title search (LIKE). |
+
+### Response `200`
+Paginated (`{ data:[...], meta:{...} }`), each item the blog list shape (includes `status`, `review_status`, `scheduled_at`, `representation`, `city`).
+
+---
+
 ## GET `/api/v1/blog/{slug}`
 
 Get a single blog post by slug.