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/sync-kobo/Auto Link Books.bru

@@ -1,24 +1,58 @@
-{
-  "meta": {
-    "name": "Auto-Link Unlinked Books",
-    "type": "http"
-  },
-  "req": {
-    "url": "{{baseUrl}}/sync/auto-link-books",
-    "method": "POST",
-    "header": [
-      {
-        "key": "Content-Type",
-        "value": "application/json"
-      },
-      {
-        "key": "Authorization",
-        "value": "Bearer {{authToken}}"
-      }
-    ],
-    "body": {
-      "confidence_threshold": 0.8,
-      "limit": 50
-    }
+meta {
+  name: Auto-Link Unlinked Books
+  type: http
+  seq: 1
+}
+
+post {
+  url: {{baseUrl}}/sync/auto-link-books
+  body: json
+  auth: inherit
+}
+
+headers {
+  Content-Type: application/json
+  Authorization: Bearer {{authToken}}
+}
+
+body:json {
+  {
+    "confidence_threshold": 0.8,
+    "limit": 50
   }
 }
+
+settings {
+  encodeUrl: true
+  timeout: 0
+}
+
+docs {
+  ## Auto-Link Unlinked Books
+
+  Automatically links unlinked books to media items based on title and author matching with a configurable confidence threshold.
+
+  **Method:** POST
+
+  **Endpoint:** /sync/auto-link-books
+
+  **Authentication:** Bearer token
+
+  **Request Body:**
+  - `confidence_threshold` (number, optional): Minimum confidence score for auto-linking (0-1, default: 0.8)
+  - `limit` (number, optional): Maximum number of books to auto-link (default: 50)
+
+  **Response:**
+  - `results` (array): Results for each auto-link attempt
+  - `total` (number): Total number of books processed
+  - `success` (number): Number of successful links
+  - `failed` (number): Number of failed links
+
+  **Status Codes:**
+  - 200: Success
+  - 400: Invalid request data
+  - 401: Unauthorized
+  - 500: Internal server error
+
+  **Note:** Higher confidence thresholds produce fewer but more accurate matches. Consider the tradeoff between automation and accuracy.
+}