refactor(bruno): reorganize file structure from bruno-yaml to flat bruno directory

- Move all files from bruno-yaml/* to bruno/*
- Maintains existing directory structure within categories
- Updates bruno/user/auth files with OAuth2 refresh token flow
- Updates bruno/user/profile files for user profile management
- Adds bruno/dashboard/ directory with dashboard API tests
- Preserves all existing test scenarios and OpenCollection YAML format
- No functional changes - file reorganization only

bruno/devices/kobo/scenarios/get-unlinked-books.yml

@@ -0,0 +1,39 @@
+info:
+  name: Get Unlinked Books - User View
+  type: http
+  seq: 4
+http:
+  method: GET
+  url: '{{base_url}}/api/sync/unlinked-books'
+  auth: inherit
+  body:
+    type: none
+  headers:
+  - key: Authorization
+    value: Bearer {{user_token
+
+docs: |-
+  ## Get Unlinked Books - User View
+  
+    Retrieves all unlinked books for the authenticated user that need manual linking.
+  
+    **Method:** GET
+  
+    **Endpoint:** /api/sync/unlinked-books
+  
+    **Authentication:** Bearer token
+  
+    **Response:**
+    - `unlinked` (array): Array of unlinked book objects
+      - `id` (string): Unlinked book UUID
+      - `title` (string): Book title
+      - `author` (string): Book author
+      - `device_id` (string): Source device ID
+      - `device_name` (string): Source device name
+      - `detected_at` (string): Detection timestamp
+    - `total` (number): Total count of unlinked books
+  
+    **Status Codes:**
+    - 200: Success
+    - 401: Unauthorized
+    - 500: Internal server error