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/library/Delete Library.yml

@@ -0,0 +1,27 @@
+info:
+  name: Delete Library
+  type: http
+  seq: 3
+http:
+  method: DELETE
+  url: '{{base_url}}/api/libraries/{{library_id}}'
+  auth: inherit
+  body:
+    type: none
+  headers:
+  - key: Content-Type
+    value: application/json
+runtime:
+  scripts:
+  - type: tests
+    code: "test_delete_library_success(status, headers, body) {\n    if (status !==\
+      \ 204) {\n      throw new Error(\"Expected status 204, got \" + status);"
+
+docs: |-
+  ## Delete Library
+    
+    Deletes a library and all associated media items.
+    
+    **Method:** DELETE
+    
+    **Endpoint:** /api/libraries/{id