- Introduced JSONResponder type in handler.go, combining JSON body parsing with ResponseHelper handling.
- Implemented ServeHTTP for JSONResponder to automatically decode JSON requests and return structured responses.
- Added comprehensive unit tests for JSONResponder in handler_test.go, covering successful responses, invalid JSON, empty bodies, and error propagation.
- Ensured all new tests adhere to existing project conventions and pass linting checks.
- Implemented JSONBodyHandler for automatic JSON body parsing.
- Added comprehensive unit tests for JSONBodyHandler covering successful decoding, invalid JSON, empty bodies, and error propagation.
- Refactored handler_test.go to improve test structure and resolve linting issues (funlen, gocritic).
