feat: add Docker support and logging enhancements

- Introduced Dockerfile and .dockerignore for containerization of the backend service.
- Added logging configuration with support for daily rolling logs and customizable log levels.
- Enhanced the server to utilize structured logging with zap, including detailed request and error logging.
- Updated configuration to include logging parameters and proxy settings.
- Implemented tests for logging configuration and proxy settings.

backend/go.mod

@@ -7,6 +7,8 @@ require (
 	github.com/gorilla/websocket v1.5.3
 	github.com/nacos-group/nacos-sdk-go/v2 v2.3.5
 	github.com/redis/go-redis/v9 v9.17.3
+	go.uber.org/zap v1.21.0
+	gopkg.in/natefinch/lumberjack.v2 v2.0.0
 )
 
 require (
@@ -71,7 +73,6 @@ require (
 	go.uber.org/atomic v1.7.0 // indirect
 	go.uber.org/mock v0.5.0 // indirect
 	go.uber.org/multierr v1.6.0 // indirect
-	go.uber.org/zap v1.21.0 // indirect
 	golang.org/x/arch v0.20.0 // indirect
 	golang.org/x/crypto v0.40.0 // indirect
 	golang.org/x/mod v0.25.0 // indirect
@@ -85,5 +86,4 @@ require (
 	google.golang.org/grpc v1.67.3 // indirect
 	google.golang.org/protobuf v1.36.9 // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect
-	gopkg.in/natefinch/lumberjack.v2 v2.0.0 // indirect
 )