feat: enhance auth, add input validation and pagination

- Add IP validation in auth handler with detailed logging
- Implement apiKeyMiddleware helper for API key verification
- Add IP and CIDR validation for whitelist operations
- Support pagination for listing temp and permanent entries
- Add parsePagination helper to extract limit and offset
- Include comprehensive unit tests for IsIP, IsCIDR, and IPMatch

cleanup.go

@@ -1,13 +1,21 @@
 package main
 
 import (
+	"context"
 	"database/sql"
 	"time"
 )
 
-func cleanupLoop(db *sql.DB, interval time.Duration) {
+func cleanupLoop(ctx context.Context, db *sql.DB, interval time.Duration) {
 	ticker := time.NewTicker(interval)
-	for range ticker.C {
-		_ = CleanupExpiredTemp(db)
+	defer ticker.Stop()
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		case <-ticker.C:
+			_ = CleanupExpiredTemp(db)
+			_ = RotateAuditLog(db, 0)
+		}
 	}
 }