refactor: standardize Bruno API requests with bruToJsonV2 format

- Convert all JSON tests to JavaScript functions for bruToJsonV2 compatibility
- Update authentication to use 'inherit' instead of manual headers
- Fix hardcoded URLs to use {{base_url}} variables
- Standardize variable syntax from {{ _.var }} to {{var}}
- Add comprehensive API documentation to all requests
- Update environment variables with missing required fields
- Apply consistent structure: meta, http method, headers, tests, vars, settings, docs
- Enhanced validation with proper error handling and field checks

bruno/progress/Get Reading Progress.bru

@@ -5,7 +5,7 @@ meta {
 }
 
 get {
-  url: http://localhost:8765/api/ebooks/{{ebookid}}/progress
+  url: {{base_url}}/api/ebooks/{{ebookid}}/progress
   body: none
   auth: inherit
 }

bruno/progress/Update Reading Progress.bru

@@ -5,7 +5,7 @@ meta {
 }
 
 put {
-  url: http://localhost:8765/api/ebooks/{{ebookid}}/progress
+  url: {{base_url}}/api/ebooks/{{ebookid}}/progress
   body: json
   auth: inherit
 }