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/collections/Update Collection.yml

@@ -0,0 +1,15 @@
+info:
+  name: Update Collection
+  type: http
+  seq: 4
+http:
+  method: PUT
+  url: '{{base_url}}/api/collections/{{collection_id}}'
+  auth: inherit
+  body:
+    type: json
+    jsonBody: "{\n    \"name\": \"Sci-Fi Favorites\",\n    \"description\": \"Updated\
+      \ description\",\n    \"color\": \"#00ff00\",\n    \"icon\": \"⭐\",\n    \"\
+      auto_assign_rules\": [\n      {\n        \"id\": \"rule-2\",\n        \"field\"\
+      : \"series\",\n        \"operator\": \"equals\",\n        \"value\": \"Foundation\"\
+      ,\n        \"priority\": 9"