docs(scanner): update Bruno requests for new scanner endpoints

- Update Scan Ebooks.bru to reflect async background scanning
- Add Get Scan Status.bru for checking job progress
- Add Start Watch Mode.bru for instant file monitoring
- Add Stop Watch Mode.bru for stopping library monitoring
- Add Get Watch Mode Status.bru for checking watched libraries
- Document all new endpoints with examples and status codes

bruno/scanner/Get Scan Status.bru

@@ -0,0 +1,71 @@
+meta {
+  name: Get Scan Status
+  type: http
+  seq: 4
+}
+
+get {
+  url: {{base_url}}/api/scanner/status/{{job_id}}
+  auth: inherit
+}
+
+settings {
+  encodeUrl: true
+  timeout: 0
+}
+
+docs {
+  ## Get Scan Status
+  
+  Retrieves the status and progress of an asynchronous scan job.
+  
+  **Method:** GET
+  
+  **Endpoint:** /api/scanner/status/:jobId
+  
+  **Authentication:** Required (Bearer token, Admin only)
+  
+  **URL Parameters:**
+  - `jobId` (string, required): The job ID returned from the scan endpoint
+    - Example: `550e8400-e29b-41d4-a716-446655440000`
+  
+  **Response:**
+  ```json
+  {
+    "job_id": "550e8400-e29b-41d4-a716-446655440000",
+    "status": "completed",
+    "error": "",
+    "result": {
+      "message": "scan completed",
+      "library_id": "550e8400-e29b-41d4-a716-446655440000"
+    },
+    "progress": 1.0
+  }
+  ```
+  
+  **Properties:**
+  - `job_id` (string): Job identifier
+  - `status` (string): Current status
+    - `pending`: Job is queued
+    - `running`: Job is currently processing
+    - `completed`: Job finished successfully
+    - `failed`: Job failed with error
+    - `cancelled`: Job was cancelled
+  - `error` (string): Error message if status is "failed"
+  - `result` (object): Scan results when completed
+    - `message` (string): Completion message
+    - `library_id` (string): Library that was scanned
+  - `progress` (number): Progress indicator (0.0 to 1.0)
+  
+  **Status Codes:**
+  - 200: Job status retrieved successfully
+  - 401: Unauthorized
+  - 403: Forbidden (admin access required)
+  - 404: Job not found
+  
+  **Example Workflow:**
+  1. POST /api/scanner/scan with folder_paths
+  2. Receive job_id in response
+  3. Poll GET /api/scanner/status/{job_id} every few seconds
+  4. When status is "completed" or "failed", stop polling
+}