feat(storage): add sqlite manager and storage config

internal/config/config.go

@@ -16,10 +16,11 @@ const (
 
 // Config captures runtime configuration for the Goaichat application.
 type Config struct {
-	API    APIConfig    `yaml:"api"`
-	Model  ModelConfig  `yaml:"model"`
+	API     APIConfig     `yaml:"api"`
+	Model   ModelConfig   `yaml:"model"`
 	Logging LoggingConfig `yaml:"logging"`
-	UI     UIConfig     `yaml:"ui"`
+	UI      UIConfig      `yaml:"ui"`
+	Storage StorageConfig `yaml:"storage"`
 }
 
 // APIConfig holds settings for connecting to the OpenAI-compatible API.
@@ -45,6 +46,13 @@ type UIConfig struct {
 	ShowTimestamps bool `yaml:"show_timestamps"`
 }
 
+// StorageConfig controls persistence locations and metadata.
+type StorageConfig struct {
+	Path     string `yaml:"path"`
+	BaseDir  string `yaml:"base_dir"`
+	Username string `yaml:"username"`
+}
+
 // Load reads configuration from the provided path, falling back to defaults and
 // environment overrides.
 func Load(path string) (*Config, error) {
@@ -123,5 +131,6 @@ func defaultConfig() Config {
 		UI: UIConfig{
 			ShowTimestamps: true,
 		},
+		Storage: StorageConfig{},
 	}
 }