refactor(bruno): migrate API tests to Bruno DSL format

- Convert all existing .bru files from JSON to Bruno DSL format
- Remove obsolete files (conflicts/api.bru, kobo/Kobo Initialization.bru)
- Update auth configuration to use 'inherit' instead of explicit bearer tokens
- Add comprehensive documentation to all test files
- Improve test scripts with proper assertions and error handling

bruno/devices/Get Kobo Shelf.bru

@@ -1,16 +1,56 @@
 meta {
-  name: Get Kobo Shelf
+  name: Get Kobo Shelf Books
   type: http
   seq: 1
 }
 
-GET {{baseURL}}/api/devices/{{deviceID}}/shelves?shelf={{shelfName}}
-Authorization: Bearer {{userToken}}
-
-{
-  "meta": {
-    "name": "Get Kobo Shelf Books",
-    "description": "Get all books on a Kobo device shelf, optionally filter by shelf name",
-    "documentation": "Returns a list of books with their shelf positions and Kobo-specific metadata (entitlement ID, revision number)."
-  }
+get {
+  url: {{baseURL}}/api/devices/{{deviceID}}/shelves?shelf={{shelfName}}
+  body: none
+  auth: inherit
+}
+
+headers {
+  Authorization: Bearer {{userToken}}
+}
+
+settings {
+  encodeUrl: true
+  timeout: 0
+}
+
+docs {
+  ## Get Kobo Shelf Books
+
+  Get all books on a Kobo device shelf, optionally filter by shelf name.
+
+  **Method:** GET
+
+  **Endpoint:** /api/devices/{deviceID}/shelves?shelf={shelfName}
+
+  **Authentication:** Bearer token
+
+  **Path Parameters:**
+  - `deviceID` (string): Device UUID
+
+  **Query Parameters:**
+  - `shelf` (string, optional): Shelf name to filter by. If omitted, returns all shelves.
+
+  **Response:**
+  - Array of books with:
+    - `id` (string): Book UUID
+    - `title` (string): Book title
+    - `author` (string): Book author
+    - `shelf_name` (string): Name of the shelf
+    - `shelf_position` (number): Position on the shelf
+    - `entitlement_id` (string): Kobo entitlement ID
+    - `revision_id` (string): Kobo revision number
+
+  **Status Codes:**
+  - 200: Success
+  - 401: Unauthorized
+  - 404: Device not found
+  - 500: Internal server error
+
+  **Note:** Returns Kobo-specific metadata (entitlement ID, revision number) required for proper Kobo sync operations.
 }