feat: add timezone configuration support to server settings and Docker image

internal/config/config.go

@@ -27,6 +27,7 @@ func getEnvInt(key string, defaultVal int) int {
 type ServerConfig struct {
 	Port       int    `yaml:"port"`
 	ListenAddr string `yaml:"listen_addr"`
+	TimeZone   string `yaml:"timezone"`
 }
 
 type DatabaseConfig struct {
@@ -95,5 +96,14 @@ func LoadConfig(path string) (*Config, error) {
 		cfg.Database.Port = 3306
 	}
 
+	if envTZ := os.Getenv("TZ"); envTZ != "" {
+		cfg.Server.TimeZone = envTZ
+	}
+
+	// Apply timezone if set
+	if cfg.Server.TimeZone != "" {
+		os.Setenv("TZ", cfg.Server.TimeZone)
+	}
+
 	return &cfg, nil
 }