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/koreader/scenarios/Sync Bookmarks (SHA-256).yml

@@ -0,0 +1,40 @@
+info:
+  name: KOReader Sync Bookmarks - SHA-256
+  type: http
+  seq: 3
+http:
+  method: POST
+  url: '{{base_url}}/api/v1/koreader/sync/bookmarks'
+  auth: inherit
+  body:
+    type: json
+    jsonBody: "{\n    \"book_sha256\": \"{{book_sha256"
+  headers:
+  - key: Authorization
+    value: Bearer {{koreader_device_token
+
+docs: |-
+  ## KOReader Sync Bookmarks - SHA-256
+  
+    Synchronizes bookmarks, notes, and highlights from KOReader using SHA-256 hash for book identification.
+  
+    **Method:** POST
+  
+    **Endpoint:** /api/v1/koreader/sync/bookmarks
+  
+    **Authentication:** Bearer token (KOReader device token)
+  
+    **Request Body:**
+    - `book_sha256` (string): SHA-256 hash of book file
+    - `bookmarks` (array): Array of bookmarks
+    - `notes` (array): Array of notes
+    - `highlights` (array): Array of highlights
+  
+    **Response:**
+    - `sync_status` (string): Sync status
+    - `total_synced` (number): Total items synced
+  
+    **Status Codes:**
+    - 200: Success
+    - 401: Unauthorized
+    - 500: Internal server error