feat: add comprehensive Bruno API tests for annotations

- Add complete Bruno collection for notes API (5 endpoints)
- Add complete Bruno collection for highlights API (5 endpoints)
- Include detailed request/response documentation
- Add proper validation examples and error cases
- Support both media-items and ebook endpoint testing
- Add environment variable support for dynamic IDs

bruno/notes/Update Media Note.bru

@@ -0,0 +1,54 @@
+meta {
+  name: Update Media Note
+  type: http
+  seq: 4
+}
+
+put {
+  url: {{base_url}}/api/media-items/{{media_item_id}}/notes/{{note_id}}
+  body: json
+  auth: inherit
+}
+
+body:json {
+  {
+    "content": "This is the updated note content.",
+    "position": "page:47"
+  }
+}
+
+script:post-response {
+  onResponse(res);
+}
+
+settings {
+  encodeUrl: true
+  timeout: 0
+}
+
+docs {
+  ## Update Media Note
+  
+  Updates an existing note.
+  
+  **Method:** PUT
+  
+  **Endpoint:** /api/media-items/:id/notes/:noteId
+  
+  **Path Parameters:**
+  - `id` (string): Media item ID
+  - `noteId` (string): Note ID
+  
+  **Request Body:**
+  - `content` (string): Updated note content (required, 1-10000 chars)
+  - `position` (string): Updated position reference (optional, max 100 chars)
+  
+  **Response:**
+  - Updated note object with all fields
+  
+  **Status Codes:**
+  - 200: Success
+  - 400: Invalid request
+  - 401: Unauthorized
+  - 404: Note not found
+}