fix: auto-create system_settings and users tables on first use

server/internal/mod/install/repository.go

@@ -164,6 +164,11 @@ func (r *installRepository) IsInstalled(ctx context.Context) (bool, error) {
 
 // upsertSetting 插入或更新设置
 func (r *installRepository) upsertSetting(ctx context.Context, key, value string) error {
+	// 先确保表存在
+	if err := r.ensureTablesExist(ctx); err != nil {
+		return err
+	}
+	
 	now := time.Now()
 	
 	result := r.db.WithContext(ctx).
@@ -189,6 +194,44 @@ func (r *installRepository) upsertSetting(ctx context.Context, key, value string
 	return nil
 }
 
+// ensureTablesExist 确保必要的表存在
+func (r *installRepository) ensureTablesExist(ctx context.Context) error {
+	// 创建 system_settings 表
+	if err := r.db.WithContext(ctx).Exec(`
+		CREATE TABLE IF NOT EXISTS system_settings (
+			id TEXT PRIMARY KEY,
+			category TEXT,
+			key TEXT UNIQUE,
+			value TEXT,
+			created_at DATETIME,
+			updated_at DATETIME
+		)
+	`).Error; err != nil {
+		return err
+	}
+	
+	// 创建 users 表
+	if err := r.db.WithContext(ctx).Exec(`
+		CREATE TABLE IF NOT EXISTS users (
+			id TEXT PRIMARY KEY,
+			username TEXT UNIQUE,
+			password_hash TEXT,
+			email TEXT,
+			email_verified BOOLEAN,
+			role TEXT,
+			status TEXT,
+			encrypted_config_key TEXT,
+			config_key_nonce TEXT,
+			created_at DATETIME,
+			updated_at DATETIME
+		)
+	`).Error; err != nil {
+		return err
+	}
+	
+	return nil
+}
+
 func boolToStr(b bool) string {
 	if b {
 		return "true"