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/media-items/Update Media Item.yml

@@ -0,0 +1,52 @@
+info:
+  name: Update Media Item
+  type: http
+  seq: 2
+http:
+  method: PUT
+  url: '{{base_url}}/api/media-items/{{media_item_id}}'
+  auth: inherit
+  body:
+    type: json
+    json:
+      title: Updated Media Item Title
+      author: Updated Author Name
+      isbn: 978-9876543210
+      description: Updated description
+      cover_image_path: /updated/path/to/cover.jpg
+      series: Updated Series Name
+      series_number: 2
+      tags:
+      - updated
+      - fiction
+      - adventure
+      asin: B09XYZ789
+      date_published: '2023-02-20'
+      publisher: Updated Publisher
+      contributors:
+      - Updated Contributor
+      language: en
+      edition: Updated Edition
+      page_count: 400
+      genre: Updated Genre
+      copyright_year: 2023
+      goodreads_id: '7890123'
+      openlibrary_id: OL789012M
+      google_books_id: GB789012
+  headers:
+  - key: Content-Type
+    value: application/json
+runtime:
+  scripts:
+  - type: tests
+    code: "test_update_media_item_success(status, headers, body) {\n    if (status\
+      \ !== 200) {\n      throw new Error(\"Expected status 200, got \" + status);"
+
+docs: |-
+  ## Update Media Item
+    
+    Updates an existing media item's metadata.
+    
+    **Method:** PUT
+    
+    **Endpoint:** /api/media-items/{id