feat(ssl): Add LetsEncrypt certificate option

app/config/config.go

@@ -13,10 +13,21 @@ type Config struct {
 		Address string `yaml:"address"`
 		Port    int    `yaml:"port"`
 	} `yaml:"listen"`
+	TLS struct {
+		Enabled     bool   `yaml:"enabled"`
+		CertFile    string `yaml:"cert_file"`
+		KeyFile     string `yaml:"key_file"`
+		LetsEncrypt struct {
+			Enabled  bool   `yaml:"enabled"`
+			Email    string `yaml:"email"`     // Email for Let's Encrypt registration
+			CacheDir string `yaml:"cache_dir"` // Directory to store certificates (default: ./certs/letsencrypt)
+			Staging  bool   `yaml:"staging"`   // Use Let's Encrypt staging environment
+		} `yaml:"letsencrypt"`
+	} `yaml:"tls"`
 	Mappings []struct {
 		External string `yaml:"external"`
 		Internal string `yaml:"internal"`
-		Port     int    `yaml:"port"` // Optional, defaults to listen port
+		Port     int    `yaml:"port"` // Optional, defaults to 5432
 	} `yaml:"mappings"`
 	Debug bool `yaml:"debug"`
 }