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/dashboard/create-collection-with-dashboard.yml

@@ -0,0 +1,38 @@
+info:
+  name: Create Collection with Dashboard
+  type: http
+  seq: 4
+http:
+  method: POST
+  url: '{{base_url}}/api/collections'
+  auth: inherit
+runtime:
+  scripts:
+  - type: tests
+    code: "test(\"creates collection successfully\", function() {\n    expect(res.status).to.eql(201);"
+
+docs: |-
+  Create a new collection with dashboard visibility enabled.
+  
+    **Endpoint**: POST /api/collections
+    **Auth**: Required (Bearer token)
+  
+    ## Request Body
+  
+    | Field | Type | Required | Description |
+    |-------|------|----------|-------------|
+    | name | string | Yes | Collection name |
+    | description | string | No | Collection description |
+    | color | string | No | Hex color code |
+    | icon | string | No | Icon emoji or name |
+    | show_on_dashboard | boolean | No | Show on dashboard (default: false) |
+  
+    ## Example Request
+  
+    ```json
+    {
+      "name": "My Favorites",
+      "description": "My favorite books",
+      "color": "#FF5733",
+      "icon": "⭐",
+      "show_on_dashboard": true