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 Popular Books.yml

@@ -0,0 +1,57 @@
+info:
+  name: Get Popular Books
+  type: http
+  seq: 1
+http:
+  method: GET
+  url: '{{base_url}}/api/analytics/popular-books?limit=10'
+  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 popular books sorted by read count.
+  
+    **Endpoint**: GET /api/analytics/popular-books
+    **Auth**: Required (Bearer token)
+  
+    ## Query Parameters
+  
+    | Parameter | Type | Required | Description |
+    |-----------|------|-----------|-------------|
+    | limit | int | No | Maximum number of books to return (default: 10) |
+  
+    ## Response Fields
+  
+    | Field | Type | Description |
+    |-------|------|-------------|
+    | books | array | List of popular books |
+    | books[].media_item_id | string | Book ID |
+    | books[].title | string | Book title |
+    | books[].author | string | Book author |
+    | books[].read_count | int | Number of times read |
+    | books[].avg_completion | float | Average completion rate (0-1) |
+    | books[].cover_url | string | Cover image URL |
+  
+    ## Example Request
+  
+    ```
+    GET /api/analytics/popular-books?limit=10
+    ```
+  
+    ## Example Response
+  
+    ```json
+    {
+      "books": [
+        {
+          "media_item_id": "323e4567-e89b-12d3-a456-426614174002",
+          "title": "The Great Gatsby",
+          "author": "F. Scott Fitzgerald",
+          "read_count": 5,
+          "avg_completion": 0.85,
+          "cover_url": "/api/books/323e4567-e89b-12d3-a456-426614174002/cover"