Fix critical linting issues for CI

- Fix package comment format
- Add comment for blank import
- Use typed context keys instead of strings
- Fix else block indentation

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: mattmattox

pkg/backup/backup.go

@@ -27,6 +27,14 @@ import (
 	"github.com/supporttools/GoSQLGuard/pkg/storage/s3"
 )
 
+// contextKey is a type for context keys to avoid collisions
+type contextKey string
+
+const (
+	// backupTypeKey is the context key for backup type
+	backupTypeKey contextKey = "backupType"
+)
+
 // BackupOptions defines options for a backup operation
 type BackupOptions struct {
 	Servers   []string // List of server names to back up, empty means all servers
@@ -533,7 +541,7 @@ func (m *Manager) backupDatabase(serverName, serverType, database, backupType st
 	}
 
 	// Create context with backup type
-	ctx := context.WithValue(context.Background(), "backupType", backupType)
+	ctx := context.WithValue(context.Background(), backupTypeKey, backupType)
 
 	// Define backup options
 	backupOpts := common.BackupOptions{

pkg/backup/database/mysql/databases.go

@@ -6,7 +6,7 @@ import (
 	"log"
 	"strings"
 
-	_ "github.com/go-sql-driver/mysql"
+	_ "github.com/go-sql-driver/mysql" // MySQL driver
 	"github.com/supporttools/GoSQLGuard/pkg/config"
 )
 

pkg/config/config.go

@@ -1,4 +1,4 @@
-// pkg/config/config.go
+// Package config provides configuration loading and management for GoSQLGuard
 package config
 
 import (

pkg/metadata/mysql_store_optimized.go

@@ -12,6 +12,14 @@ import (
 	"gorm.io/gorm"
 )
 
+// contextKey is a type for context keys
+type contextKey string
+
+const (
+	// startTimeKey is the context key for query start time
+	startTimeKey contextKey = "start_time"
+)
+
 // PaginatedResult represents a paginated query result
 type PaginatedResult struct {
 	Data       []types.BackupMeta `json:"data"`
@@ -494,13 +502,13 @@ func joinColumns(columns []string) string {
 // EnableQueryLogging enables slow query logging for performance monitoring
 func EnableQueryLogging(db *gorm.DB, threshold time.Duration) {
 	db.Callback().Query().After("gorm:query").Register("log_slow_queries", func(tx *gorm.DB) {
-		elapsed := time.Since(tx.Statement.Context.Value("start_time").(time.Time))
+		elapsed := time.Since(tx.Statement.Context.Value(startTimeKey).(time.Time))
 		if elapsed > threshold {
 			log.Printf("Slow query detected (%.3fs): %s", elapsed.Seconds(), tx.Statement.SQL.String())
 		}
 	})
 
 	db.Callback().Query().Before("gorm:query").Register("set_query_start_time", func(tx *gorm.DB) {
-		tx.Statement.Context = context.WithValue(tx.Statement.Context, "start_time", time.Now())
+		tx.Statement.Context = context.WithValue(tx.Statement.Context, startTimeKey, time.Now())
 	})
 }