🐛 fix: correct database.ssl_mode environment variable binding

- Fix environment variable binding for SSL mode
- Use correct mapstructure tag name
- Match struct field binding

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

pkg/config/config.go

@@ -194,7 +194,7 @@ func LoadConfig() (*Config, error) {
 	v.BindEnv("database.user", "DLC_DATABASE_USER")
 	v.BindEnv("database.password", "DLC_DATABASE_PASSWORD")
 	v.BindEnv("database.name", "DLC_DATABASE_NAME")
-	v.BindEnv("database.sslmode", "DLC_DATABASE_SSL_MODE")
+	v.BindEnv("database.ssl_mode", "DLC_DATABASE_SSL_MODE")
 
 	// Unmarshal into Config struct
 	var config Config