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/books/Bulk Update Books.yml

@@ -0,0 +1,55 @@
+info:
+  name: Bulk Update Media Items
+  type: http
+  seq: 2
+http:
+  method: POST
+  url: '{{base_url}}/api/media-items/bulk-update'
+  auth: inherit
+  body:
+    type: json
+    jsonBody: "{\n    \"media_item_updates\": [\n      {\n        \"media_item_id\"\
+      : \"{{bookId1"
+  headers:
+  - key: Content-Type
+    value: application/json
+
+docs: |-
+  ## Bulk Update Media Items
+  
+    Updates multiple media items in a single request with different fields for each item.
+  
+    **Method:** POST
+  
+    **Endpoint:** /api/media-items/bulk-update
+  
+    **Authentication:** Required (Bearer token)
+  
+    **Request Body:**
+    - `media_item_updates` (array): Array of update objects
+      - `media_item_id` (string): Media item UUID to update
+      - `updates` (object): Fields to update (can include title, author, genre, tags, contributors, etc.)
+  
+    **Response:**
+    - `results` (array): Results for each update attempt
+    - `total` (number): Total number of media items processed
+    - `updated` (number): Number of successfully updated media items
+    - `failed` (number): Number of failed updates
+  
+    **Status Codes:**
+    - 200: Success (with partial results if some failed)
+    - 400: Invalid request data
+    - 401: Unauthorized
+    - 403: Forbidden
+    - 500: Internal server error
+  
+    **Example:**
+    ```json
+    {
+      "media_item_updates": [
+        {
+          "media_item_id": "uuid-1",
+          "updates": {
+            "title": "New Title",
+            "genre": "Fiction",
+            "tags": ["fiction", "adventure"]