fix(bruno): correct JSON syntax in Scan Media Items request

Fix critical bug where library_id variable was not quoted in the request
body, causing invalid JSON that was rejected by the API parser.

Changes:
- Quote library_id variable: {{library_id}} → "{{library_id}}"
- Add explicit Content-Type header
- Update request body format to use proper YAML multi-line string

Root Cause:
- Unquoted UUID in JSON: {"library_id": 551ac19c-896a-...}
- Produced invalid JSON that failed c.Bind() in scanner handler
- Handler returned 400 "invalid request" error

Impact:
- Bruno requests for scanning now work correctly
- API scan endpoint accepts request successfully
- Enables proper testing of scan functionality via Bruno

Testing:
- Verified scan request completes successfully
- Job ID returned correctly
- Scanner processes files as expected

File: bruno/scanner/Scan Media Items.yml

bruno/scanner/Scan Media Items.yml

@@ -2,13 +2,30 @@ info:
   name: Scan Media Items (Background)
   type: http
   seq: 1
+
 http:
   method: POST
-  url: '{{base_url}}/api/scanner/scan'
-  auth: inherit
+  url: "{{base_url}}/api/scanner/scan"
+  headers:
+    - name: Content-Type
+      value: application/json
+  params:
+    - name: ""
+      value: ""
+      type: query
   body:
     type: json
-    jsonBody: "{\n    \"folder_paths\": [\"/path/to/media\"]"
+    data: |-
+      {
+        "library_id": "{{library_id}}"
+      }
+  auth: inherit
+
+settings:
+  encodeUrl: true
+  timeout: 0
+  followRedirects: true
+  maxRedirects: 5
 
 docs: |-
   ## Scan Media Items (Background)