feat(logging): Implement database logging with app_log table

- Created migration to set up app_log table for storing application logs.
- Added AppLog entity and repository for ORM handling of logs.
- Developed DbLogger service to persist logs of level WARNING and above to the database while maintaining existing logging behavior.
- Implemented tests for admin log retrieval and DbLogger functionality to ensure proper logging behavior.
- Enhanced logging context sanitization for better error tracking.

docs/api/admin.md

@@ -1078,3 +1078,53 @@ Reject a pending request. **Permission:** `ROLE_ADMIN`
 تأیید/رد از طریق `POST /api/v1/settlement/{uuid}/approve|reject` (در `docs/api/settlement.md`).
 
 **Errors:** `NOT_FOUND` (404) — درخواست یافت نشد.
+
+---
+
+## Application Logs
+
+Persisted application logs (`warning` level and above). Written by the `DbLogger`
+decorator over the `logger` service into the `app_log` table — every
+`LoggerInterface::warning()/error()/critical()/...` call across the backend lands
+here, while `info`/`debug` go to stderr only.
+
+### GET `/api/v1/admin/logs`
+
+List persisted logs with pagination and filters.
+
+**Permission:** `ROLE_ADMIN`
+
+### Query Parameters
+| Param | Type | Required | Description |
+|-------|------|----------|-------------|
+| `page` | integer | ❌ | Default: 1 |
+| `limit` | integer | ❌ | Default: 25 (max 100) |
+| `level` | string | ❌ | Exact PSR level: `warning`, `error`, `critical`, `alert`, `emergency` |
+| `search` | string | ❌ | Substring match on the message |
+| `from` | integer | ❌ | Unix timestamp lower bound (`created_at >=`) |
+| `to` | integer | ❌ | Unix timestamp upper bound (`created_at <=`) |
+
+Ordered by newest first (`id DESC`).
+
+### Response `200`
+```json
+{
+  "success": true,
+  "data": [
+    {
+      "id": 4213,
+      "level": "error",
+      "message": "Unhandled exception: RuntimeException: boom @ /var/www/html/src/Foo.php:42 [path=/oauth/userinfo]",
+      "context": "{\"exception\":\"RuntimeException: boom @ /var/www/html/src/Foo.php:42\"}",
+      "channel": "app",
+      "path": "/oauth/userinfo",
+      "created_at": 1717000000
+    }
+  ],
+  "meta": { "totalRecords": 137, "totalPages": 6, "currentPage": 1 }
+}
+```
+
+Notes:
+- `context` is a JSON string (or `null`); a `Throwable` in the context is stored as a compact `Class: message @ file:line` string, never the raw object.
+- `created_at` is a Unix timestamp (integer).