feat: base volume path setting

Add global base_volume_path to settings. Relative volume source
paths are automatically prepended with the base path at deploy
time. Absolute paths are used as-is. Configurable in Settings >
General.

internal/deployer/deployer.go

@@ -707,9 +707,19 @@ func (d *Deployer) computeVolumeMounts(projectID, stageName, imageTag string) []
 		return nil
 	}
 
+	// Get base volume path from settings.
+	basePath := ""
+	if settings, err := d.store.GetSettings(); err == nil {
+		basePath = settings.BaseVolumePath
+	}
+
 	mounts := make([]mount.Mount, 0, len(vols))
 	for _, vol := range vols {
 		source := vol.Source
+		// Prepend base path if source is relative (doesn't start with /).
+		if basePath != "" && !filepath.IsAbs(source) {
+			source = filepath.Join(basePath, source)
+		}
 		if vol.Mode == "isolated" {
 			source = filepath.Join(source, fmt.Sprintf("%s-%s", stageName, imageTag))
 		}

internal/store/models.go

@@ -53,6 +53,7 @@ type Settings struct {
 	NpmPassword      string `json:"npm_password"`
 	WebhookSecret    string `json:"webhook_secret"`
 	PollingInterval  string `json:"polling_interval"`
+	BaseVolumePath   string `json:"base_volume_path"`
 	UpdatedAt        string `json:"updated_at"`
 }
 

internal/store/settings.go

@@ -9,10 +9,10 @@ func (s *Store) GetSettings() (Settings, error) {
 	var st Settings
 	err := s.db.QueryRow(
 		`SELECT domain, server_ip, network, subdomain_pattern, notification_url,
-		        npm_url, npm_email, npm_password, webhook_secret, polling_interval, updated_at
+		        npm_url, npm_email, npm_password, webhook_secret, polling_interval, base_volume_path, updated_at
 		 FROM settings WHERE id = 1`,
 	).Scan(&st.Domain, &st.ServerIP, &st.Network, &st.SubdomainPattern, &st.NotificationURL,
-		&st.NpmURL, &st.NpmEmail, &st.NpmPassword, &st.WebhookSecret, &st.PollingInterval, &st.UpdatedAt)
+		&st.NpmURL, &st.NpmEmail, &st.NpmPassword, &st.WebhookSecret, &st.PollingInterval, &st.BaseVolumePath, &st.UpdatedAt)
 	if err != nil {
 		return Settings{}, fmt.Errorf("query settings: %w", err)
 	}
@@ -25,10 +25,10 @@ func (s *Store) UpdateSettings(st Settings) error {
 	_, err := s.db.Exec(
 		`UPDATE settings SET
 			domain=?, server_ip=?, network=?, subdomain_pattern=?, notification_url=?,
-			npm_url=?, npm_email=?, npm_password=?, webhook_secret=?, polling_interval=?, updated_at=?
+			npm_url=?, npm_email=?, npm_password=?, webhook_secret=?, polling_interval=?, base_volume_path=?, updated_at=?
 		 WHERE id = 1`,
 		st.Domain, st.ServerIP, st.Network, st.SubdomainPattern, st.NotificationURL,
-		st.NpmURL, st.NpmEmail, st.NpmPassword, st.WebhookSecret, st.PollingInterval, st.UpdatedAt,
+		st.NpmURL, st.NpmEmail, st.NpmPassword, st.WebhookSecret, st.PollingInterval, st.BaseVolumePath, st.UpdatedAt,
 	)
 	if err != nil {
 		return fmt.Errorf("update settings: %w", err)

internal/store/store.go

@@ -71,6 +71,8 @@ func (s *Store) runMigrations() error {
 	migrations := []string{
 		// Add owner column to registries (2026-03-28).
 		`ALTER TABLE registries ADD COLUMN owner TEXT NOT NULL DEFAULT ''`,
+		// Add base_volume_path to settings (2026-03-28).
+		`ALTER TABLE settings ADD COLUMN base_volume_path TEXT NOT NULL DEFAULT ''`,
 	}
 
 	for _, m := range migrations {
@@ -131,6 +133,7 @@ CREATE TABLE IF NOT EXISTS settings (
 	npm_password        TEXT NOT NULL DEFAULT '',
 	webhook_secret      TEXT NOT NULL DEFAULT '',
 	polling_interval    TEXT NOT NULL DEFAULT '5m',
+	base_volume_path   TEXT NOT NULL DEFAULT '',
 	updated_at          TEXT NOT NULL DEFAULT (datetime('now'))
 );