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/Get Unlinked Book Suggestions.bru

@@ -1,16 +1,50 @@
-{
-  "meta": {
-    "name": "Get Unlinked Book Suggestions",
-    "type": "http"
-  },
-  "req": {
-    "url": "{{baseUrl}}/sync/unlinked-books/{{unlinkedBookId}}/suggestions",
-    "method": "GET",
-    "header": [
-      {
-        "key": "Authorization",
-        "value": "Bearer {{authToken}}"
-      }
-    ]
-  }
+meta {
+  name: Get Unlinked Book Suggestions
+  type: http
+  seq: 1
+}
+
+get {
+  url: {{baseUrl}}/sync/unlinked-books/{{unlinkedBookId}}/suggestions
+  body: none
+  auth: inherit
+}
+
+headers {
+  Authorization: Bearer {{authToken}}
+}
+
+settings {
+  encodeUrl: true
+  timeout: 0
+}
+
+docs {
+  ## Get Unlinked Book Suggestions
+
+  Retrieves suggested media items from the library that match an unlinked book, enabling manual linking.
+
+  **Method:** GET
+
+  **Endpoint:** /sync/unlinked-books/{unlinkedBookId}/suggestions
+
+  **Authentication:** Bearer token
+
+  **Path Parameters:**
+  - `unlinkedBookId` (string): Unlinked book UUID
+
+  **Response:**
+  - Array of suggested media items with:
+    - `id` (string): Media item UUID
+    - `title` (string): Media item title
+    - `author` (string): Media item author
+    - `confidence_score` (number): Match confidence (0-1)
+    - `match_reasons` (array): Reasons for the suggestion
+
+  **Status Codes:**
+  - 200: Success
+  - 401: Unauthorized
+  - 404: Unlinked book not found
+
+  **Note:** Suggestions are generated based on title similarity, author matching, and other metadata comparisons.
 }