ci: add golangci-lint config and fix formatting

- Add .golangci.yml with minimal linters (govet, ineffassign)
- Run gofmt -s and goimports on all files to fix formatting
- Disable fieldalignment and copylocks checks in govet

internal/database/interface.go

@@ -8,9 +8,9 @@ import (
 
 	"dbbackup/internal/config"
 	"dbbackup/internal/logger"
-	
-	_ "github.com/jackc/pgx/v5/stdlib"     // PostgreSQL driver (pgx - high performance)
-	_ "github.com/go-sql-driver/mysql"     // MySQL driver
+
+	_ "github.com/go-sql-driver/mysql" // MySQL driver
+	_ "github.com/jackc/pgx/v5/stdlib" // PostgreSQL driver (pgx - high performance)
 )
 
 // Database represents a database connection and operations
@@ -19,43 +19,43 @@ type Database interface {
 	Connect(ctx context.Context) error
 	Close() error
 	Ping(ctx context.Context) error
-	
+
 	// Database discovery
 	ListDatabases(ctx context.Context) ([]string, error)
 	ListTables(ctx context.Context, database string) ([]string, error)
-	
+
 	// Database operations
 	CreateDatabase(ctx context.Context, name string) error
 	DropDatabase(ctx context.Context, name string) error
 	DatabaseExists(ctx context.Context, name string) (bool, error)
-	
+
 	// Information
 	GetVersion(ctx context.Context) (string, error)
 	GetDatabaseSize(ctx context.Context, database string) (int64, error)
 	GetTableRowCount(ctx context.Context, database, table string) (int64, error)
-	
+
 	// Backup/Restore command building
 	BuildBackupCommand(database, outputFile string, options BackupOptions) []string
 	BuildRestoreCommand(database, inputFile string, options RestoreOptions) []string
 	BuildSampleQuery(database, table string, strategy SampleStrategy) string
-	
+
 	// Validation
 	ValidateBackupTools() error
 }
 
 // BackupOptions holds options for backup operations
 type BackupOptions struct {
-	Compression     int
-	Parallel        int
-	Format          string  // "custom", "plain", "directory"
-	Blobs          bool
-	SchemaOnly     bool
-	DataOnly       bool
-	NoOwner        bool
-	NoPrivileges   bool
-	Clean          bool
-	IfExists       bool
-	Role           string
+	Compression  int
+	Parallel     int
+	Format       string // "custom", "plain", "directory"
+	Blobs        bool
+	SchemaOnly   bool
+	DataOnly     bool
+	NoOwner      bool
+	NoPrivileges bool
+	Clean        bool
+	IfExists     bool
+	Role         string
 }
 
 // RestoreOptions holds options for restore operations
@@ -77,12 +77,12 @@ type SampleStrategy struct {
 
 // DatabaseInfo holds database metadata
 type DatabaseInfo struct {
-	Name         string
-	Size         int64
-	Owner        string
-	Encoding     string
-	Collation    string
-	Tables       []TableInfo
+	Name      string
+	Size      int64
+	Owner     string
+	Encoding  string
+	Collation string
+	Tables    []TableInfo
 }
 
 // TableInfo holds table metadata
@@ -105,10 +105,10 @@ func New(cfg *config.Config, log logger.Logger) (Database, error) {
 
 // Common database implementation
 type baseDatabase struct {
-	cfg  *config.Config
-	log  logger.Logger
-	db   *sql.DB
-	dsn  string
+	cfg *config.Config
+	log logger.Logger
+	db  *sql.DB
+	dsn string
 }
 
 func (b *baseDatabase) Close() error {
@@ -131,4 +131,4 @@ func buildTimeout(ctx context.Context, timeout time.Duration) (context.Context,
 		timeout = 30 * time.Second
 	}
 	return context.WithTimeout(ctx, timeout)
-}
+}