refactor: improve error handling and fix linter warnings

- Add nolint comments for type assertion errcheck in gjson/encode.go
  (switch case guarantees type safety)
- Handle fasthttp.Serve errors in benchmark mock backends
- Rename error variables to avoid shadowing in server.go
- Use underscore for unused loop variables

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

gjson/encode.go

@@ -23,11 +23,11 @@ func encodeLuaValue(L *glua.LState, value glua.LValue, config *Config, depth int
 		return "false", nil
 
 	case glua.LTNumber:
-		num := float64(value.(glua.LNumber))
+		num := float64(value.(glua.LNumber)) //nolint:errcheck // switch case guarantees type
 		return formatNumber(num, config.encodeNumberPrecision), nil
 
 	case glua.LTString:
-		str := string(value.(glua.LString))
+		str := string(value.(glua.LString)) //nolint:errcheck // switch case guarantees type
 		// Use go-json for proper string escaping
 		result, err := json.Marshal(str)
 		if err != nil {
@@ -36,7 +36,7 @@ func encodeLuaValue(L *glua.LState, value glua.LValue, config *Config, depth int
 		return string(result), nil
 
 	case glua.LTTable:
-		return encodeTable(L, value.(*glua.LTable), config, depth)
+		return encodeTable(L, value.(*glua.LTable), config, depth) //nolint:errcheck // switch case guarantees type
 
 	case glua.LTUserData:
 		if isNull(value) {
@@ -82,7 +82,7 @@ func checkArrayType(tbl *glua.LTable, config *Config) (bool, int, int) {
 	count := 0
 	hasStringKey := false
 
-	tbl.ForEach(func(key, value glua.LValue) {
+	tbl.ForEach(func(key, _ glua.LValue) {
 		switch k := key.(type) {
 		case glua.LNumber:
 			// Protect against integer overflow - only accept positive integers within int range

internal/benchmark/tools/tools.go

@@ -61,10 +61,14 @@ func SimpleMockBackend(statusCode int, responseBody []byte) (string, func()) {
 		ctx.SetBody(responseBody)
 	}
 
-	go fasthttp.Serve(ln, handler)
+	go func() {
+		if serveErr := fasthttp.Serve(ln, handler); serveErr != nil {
+			panic(serveErr)
+		}
+	}()
 
 	return ln.Addr().String(), func() {
-		ln.Close()
+		_ = ln.Close()
 	}
 }
 
@@ -87,10 +91,14 @@ func ErrorMockBackend(errorRate float64, errorBody []byte) (string, func()) {
 		ctx.SetBody([]byte("OK"))
 	}
 
-	go fasthttp.Serve(ln, handler)
+	go func() {
+		if serveErr := fasthttp.Serve(ln, handler); serveErr != nil {
+			panic(serveErr)
+		}
+	}()
 
 	return ln.Addr().String(), func() {
-		ln.Close()
+		_ = ln.Close()
 	}
 }
 
@@ -107,10 +115,14 @@ func DelayedMockBackend(delay time.Duration, statusCode int, responseBody []byte
 		ctx.SetBody(responseBody)
 	}
 
-	go fasthttp.Serve(ln, handler)
+	go func() {
+		if serveErr := fasthttp.Serve(ln, handler); serveErr != nil {
+			panic(serveErr)
+		}
+	}()
 
 	return ln.Addr().String(), func() {
-		ln.Close()
+		_ = ln.Close()
 	}
 }
 
@@ -154,9 +166,13 @@ func StartMockFasthttpBackend(config MockBackendConfig) (string, func()) {
 		}
 	}
 
-	go fasthttp.Serve(ln, handler)
+	go func() {
+		if serveErr := fasthttp.Serve(ln, handler); serveErr != nil {
+			panic(serveErr)
+		}
+	}()
 
 	return ln.Addr().String(), func() {
-		ln.Close()
+		_ = ln.Close()
 	}
 }

internal/server/server.go

@@ -649,9 +649,9 @@ func (s *Server) startMultiServerMode() error {
 
 			// 注册状态监控端点（仅默认服务器）
 			if serverCfg.Default && s.config.Monitoring.Status.Enabled {
-				statusHandler, err := NewStatusHandler(s, &s.config.Monitoring.Status)
-				if err != nil {
-					logging.Error().Msg("Failed to create status handler: " + err.Error())
+				statusHandler, statusErr := NewStatusHandler(s, &s.config.Monitoring.Status)
+				if statusErr != nil {
+					logging.Error().Msg("Failed to create status handler: " + statusErr.Error())
 				} else {
 					router.GET(statusHandler.Path(), statusHandler.ServeHTTP)
 				}
@@ -659,9 +659,9 @@ func (s *Server) startMultiServerMode() error {
 
 			// 注册 pprof 性能分析端点（仅默认服务器）
 			if serverCfg.Default && s.config.Monitoring.Pprof.Enabled {
-				pprofHandler, err := NewPprofHandler(&s.config.Monitoring.Pprof)
-				if err != nil {
-					logging.Error().Msg("Failed to create pprof handler: " + err.Error())
+				pprofHandler, pprofErr := NewPprofHandler(&s.config.Monitoring.Pprof)
+				if pprofErr != nil {
+					logging.Error().Msg("Failed to create pprof handler: " + pprofErr.Error())
 				} else {
 					router.GET(pprofHandler.Path(), pprofHandler.ServeHTTP)
 					router.GET(pprofHandler.Path()+"/{profile:*}", pprofHandler.ServeHTTP)