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/analytics/Get Device Usage.yml

@@ -0,0 +1,47 @@
+info:
+  name: Get Device Usage
+  type: http
+  seq: 2
+http:
+  method: GET
+  url: '{{base_url}}/api/analytics/device-usage'
+  auth: inherit
+  body:
+    type: none
+runtime:
+  scripts:
+  - type: tests
+    code: "test(\"status must be 200\", function() {\n    expect(res.status).to.eql(200);"
+
+docs: |-
+  Get usage statistics for all devices.
+  
+    **Endpoint**: GET /api/analytics/device-usage
+    **Auth**: Required (Bearer token)
+  
+    ## Response Fields
+  
+    | Field | Type | Description |
+    |-------|------|-------------|
+    | devices | array | List of device usage statistics |
+    | devices[].id | string | Device ID |
+    | devices[].device_name | string | Device name |
+    | devices[].device_type | string | Device type (kobo, kindle, koreader) |
+    | devices[].sync_count | int | Number of sync operations |
+    | devices[].last_sync | string | Last sync timestamp |
+    | devices[].total_reading_minutes | int | Total reading time on device |
+    | devices[].books_read | int | Number of books completed on device |
+  
+    ## Example Response
+  
+    ```json
+    {
+      "devices": [
+        {
+          "id": "789e4567-e89b-12d3-a456-426614174001",
+          "device_name": "My Kobo Clara",
+          "device_type": "kobo",
+          "sync_count": 45,
+          "last_sync": "2026-02-08T17:25:00Z",
+          "total_reading_minutes": 1250,
+          "books_read": 3