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/Approve Registration - Kobo.yml

@@ -0,0 +1,60 @@
+info:
+  name: Approve Registration - Kobo
+  type: http
+  seq: 14
+
+http:
+  method: GET
+  url: '{{base_url}}/api/devices/approve/reg-uuid-456'
+  auth: inherit
+
+docs: |-
+  ## Approve Kobo Device Registration
+
+  Approves a pending Kobo e-reader device registration.
+
+  **Method:** GET
+
+  **Endpoint:** /api/devices/approve/:registration_id
+
+  **Authentication:** Required (Bearer token)
+
+  **Path Parameters:**
+  - `registration_id` (string): Example: `reg-uuid-456`
+
+  **Response:**
+  - `registration_id` (string): Approved registration UUID
+  - `device_id` (string): Generated device UUID
+  - `device_name` (string): Kobo device name
+  - `device_type` (string): `kobo`
+  - `status` (string): `approved`
+  - `access_token` (string): Device access token
+  - `sync_endpoints` (object):
+    - `bookmark_sync` (string): Bookmark sync URL
+    - `markup_sync` (string): Markup/highlight sync URL
+    - `metadata_sync` (string): Metadata sync URL
+  - `kobo_features` (object):
+    - `supports_shelves` (boolean): Kobo shelf support
+    - `supports_dictionary` (boolean): Dictionary annotation support
+    - `supports_statistics` (boolean): Reading statistics support
+
+  **Status Codes:**
+  - 200: Approved successfully
+  - 401: Unauthorized
+  - 403: Forbidden
+  - 404: Registration not found
+
+  **Kobo-Specific Features:**
+  - Native Kobo sync protocol support
+  - Shelves/collections sync
+  - Reading statistics sync
+  - Dictionary lookups with annotations
+  - Book metadata sync
+  - Pocket articles integration
+
+  **After Approval:**
+  - Kobo device can use native sync feature
+  - Device appears in Nickel (Kobo UI)
+  - Sync runs automatically when connected
+  - Shelves sync with collections
+  - Reading progress syncs across devices