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/tui/dbselector.go

@@ -84,7 +84,7 @@ func (m DatabaseSelectorModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 			m.databases = []string{"Error loading databases"}
 		} else {
 			m.databases = msg.databases
-			
+
 			// Auto-select database if specified
 			if m.config.TUIAutoDatabase != "" {
 				for i, db := range m.databases {
@@ -92,7 +92,7 @@ func (m DatabaseSelectorModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 						m.cursor = i
 						m.selected = db
 						m.logger.Info("Auto-selected database", "database", db)
-						
+
 						// If sample backup, ask for ratio (or auto-use default)
 						if m.backupType == "sample" {
 							if m.config.TUIDryRun {
@@ -107,7 +107,7 @@ func (m DatabaseSelectorModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 								ValidateInt(1, 100))
 							return inputModel, nil
 						}
-						
+
 						// For single backup, go directly to execution
 						executor := NewBackupExecution(m.config, m.logger, m.parent, m.ctx, m.backupType, m.selected, 0)
 						return executor, executor.Init()
@@ -136,7 +136,7 @@ func (m DatabaseSelectorModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		case "enter":
 			if !m.loading && m.err == nil && len(m.databases) > 0 {
 				m.selected = m.databases[m.cursor]
-				
+
 				// If sample backup, ask for ratio first
 				if m.backupType == "sample" {
 					inputModel := NewInputModel(m.config, m.logger, m,
@@ -146,7 +146,7 @@ func (m DatabaseSelectorModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 						ValidateInt(1, 100))
 					return inputModel, nil
 				}
-				
+
 				// For single backup, go directly to execution
 				executor := NewBackupExecution(m.config, m.logger, m.parent, m.ctx, m.backupType, m.selected, 0)
 				return executor, executor.Init()