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/devices/scenarios/Update Sync Frequency.yml

@@ -0,0 +1,66 @@
+info:
+  name: Update Sync Frequency
+  type: http
+  seq: 9
+
+http:
+  method: PUT
+  url: '{{base_url}}/api/devices/{{device_id}}'
+  auth: inherit
+  headers:
+    - key: Content-Type
+      value: application/json
+  body:
+    type: json
+    json:
+      device_name: My Kobo Clara
+      sync_enabled: true
+      auto_sync: true
+      sync_frequency_minutes: 15
+
+docs: |-
+  ## Update Sync Frequency
+
+  Changes how often the device automatically syncs with the server.
+
+  **Method:** PUT
+
+  **Endpoint:** /api/devices/:device_id
+
+  **Authentication:** Required (Bearer token)
+
+  **Path Parameters:**
+  - `device_id` (string): UUID of the device
+
+  **Request Body:**
+  - `device_name` (string, optional): Device name
+  - `sync_enabled` (boolean): Must be `true` for auto-sync
+  - `auto_sync` (boolean): Must be `true`
+  - `sync_frequency_minutes` (integer): New sync interval (5-1440)
+
+  **Response:**
+  - `id` (string): Device UUID
+  - `sync_enabled` (boolean): `true`
+  - `auto_sync` (boolean): `true`
+  - `sync_frequency_minutes` (integer): Updated interval
+  - `next_sync_at` (string): Estimated next sync time
+  - `updated_at` (string): Update timestamp
+
+  **Status Codes:**
+  - 200: Frequency updated successfully
+  - 400: Invalid frequency value
+  - 401: Unauthorized
+  - 403: Forbidden
+  - 404: Device not found
+
+  **Recommended Frequencies:**
+  - **Active reading:** 5-10 minutes
+  - **Normal usage:** 15-30 minutes
+  - **Occasional reading:** 30-60 minutes
+  - **Battery saving:** 60+ minutes
+  - **WiFi only (3G):** 30-60 minutes
+
+  **Notes:**
+  - More frequent sync = more battery usage
+  - Sync only occurs when device is online
+  - Manual sync can be triggered anytime regardless of frequency