refactor: standardize Bruno API requests with bruToJsonV2 format

- Convert all JSON tests to JavaScript functions for bruToJsonV2 compatibility
- Update authentication to use 'inherit' instead of manual headers
- Fix hardcoded URLs to use {{base_url}} variables
- Standardize variable syntax from {{ _.var }} to {{var}}
- Add comprehensive API documentation to all requests
- Update environment variables with missing required fields
- Apply consistent structure: meta, http method, headers, tests, vars, settings, docs
- Enhanced validation with proper error handling and field checks

bruno/scanner/Start Scanner.bru

@@ -6,5 +6,35 @@ meta {
 
 post {
   url: {{base_url}}/api/scanner/start
-  auth: bearer
+  auth: inherit
+}
+
+settings {
+  encodeUrl: true
+  timeout: 0
+}
+
+docs {
+  ## Start Scanner
+  
+  Starts the media scanner service for indexing library content.
+  
+  **Method:** POST
+  
+  **Endpoint:** /api/scanner/start
+  
+  **Authentication:** Required (Bearer token)
+  
+  **Response:**
+  - JSON object containing scanner status
+    - `status` (string): Scanner state ("started", "running")
+    - `message` (string): Status message
+    - `started_at` (string): Timestamp when scanner started
+  
+  **Status Codes:**
+  - 200: Scanner started successfully
+  - 401: Unauthorized
+  - 403: Forbidden (insufficient permissions)
+  - 409: Scanner already running
+  - 500: Internal server error
 }