- Removed deprecated `thumbnailParams` struct from `thumbnails.go`.
- Updated `server_test.go` to use an anonymous struct for response unmarshalling.
- Enhanced `swagger.json` with detailed definitions for SendRequest and SendMessageResponse.
- Introduced new `swaggerParams.go` to define Swagger parameters for various API endpoints.
- Created `swaggerResponses.go` to define Swagger responses for API endpoints.
- Cleaned up unused JSON error message definitions and consolidated error responses.
- Improved documentation for Chaos triggers and web UI configuration responses.
