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/sidecar/Get Device Sidecar Config.bru

@@ -1,21 +1,61 @@
 meta {
-  name: "Get Device Sidecar Config"
+  name: Get Device Sidecar Config
   type: http
   seq: 1
 }
 
 get {
   url: {{base_url}}/api/devices/{{device_id}}/sidecar
-  auth: {
-    type: bearer
-    bearer: {{user_token}}
-  }
+  body: none
+  auth: inherit
 }
 
-assert {
-  response.status == 200
-  response.body.version == "1.0"
-  response.body.bookhoard exists()
-  response.body.books exists()
-  response.body.collections exists()
+headers {
+  Authorization: Bearer {{user_token}}
+  Content-Type: application/json
+}
+
+script:post-response {
+  function onResponse(res) {
+    if (res.getStatus() === 200) {
+      const body = res.getBody();
+      tests('Version is 1.0', body.version === "1.0");
+      tests('Has bookhoard config', body.bookhoard !== undefined);
+      tests('Has books array', body.books !== undefined);
+      tests('Has collections array', body.collections !== undefined);
+    }
+  }
+  onResponse(res);
+}
+
+settings {
+  encodeUrl: true
+  timeout: 0
+}
+
+docs {
+  ## Get Device Sidecar Config
+
+  Retrieves sidecar configuration for a specific device.
+
+  **Method:** GET
+
+  **Endpoint:** /api/devices/{device_id}/sidecar
+
+  **Authentication:** Bearer token
+
+  **Path Parameters:**
+  - `device_id` (string): Device UUID
+
+  **Response:**
+  - `version` (string): Sidecar version (e.g., "1.0")
+  - `bookhoard` (object): Bookhoard configuration
+  - `books` (array): Array of book configurations
+  - `collections` (array): Array of collection configurations
+
+  **Status Codes:**
+  - 200: Success
+  - 401: Unauthorized
+  - 404: Device not found
+  - 500: Internal server error
 }