fix(bruno): add missing variables to environment and remove invalid vars sections

- Add missing variables to Bookmann environment:
  - library_id (snake_case variant)
  - media_item_id (snake_case variant)
  - job_id for scan status tracking
  - baseUrl (camelCase variant for compatibility)
  - refreshToken to secret vars
- Remove invalid vars sections from request files
  - Variables should be referenced directly from environment
  - Vars sections are for request-specific overrides, not env references
- All variables now properly defined and accessible

bruno/environments/Bookmann.bru

@@ -1,5 +1,6 @@
 vars {
   base_url: http://localhost:8765
+  baseUrl: http://localhost:8765
   ebookid: 02a535a4-19f8-43fa-b81b-89a226d19dd9
   fakebookid: 123e4567-e89b-12d3-a456-426614174000
   user_id: c51118f0-31fc-4c32-827d-517d6599bf21
@@ -8,10 +9,14 @@ vars {
   highlight_id: 660f9501-f29b-51d4-b716-446655440001
   note_id: 7710a602-g29b-61d4-c716-446655440002
   libraryId: 8821b703-h29b-71d4-d716-446655440003
+  library_id: 8821b703-h29b-71d4-d716-446655440003
   mediaItemId: 9932c704-i29b-81d4-e716-446655440004
+  media_item_id: 9932c704-i29b-81d4-e716-446655440004
+  job_id: 550e8400-e29b-41d4-a716-446655440000
   rating: 5
   isVisible: true
 }
 vars:secret [
   token
+  refreshToken
 ]