feat: enhance security with IP banning, ownership checks, and SSRF protection

Add comprehensive security improvements across the application:

- **IP-based login protection**: Implement IP ban system tracking login failures, auto-banning after threshold exceeded
- **Ownership verification**: Add userID parameter to Delete/Update operations for posts and comments to prevent unauthorized modifications
- **SSRF protection**: Add URL and resolved host validation for image URLs in chat and OpenAI client
- **SQL injection prevention**: Add EscapeLikeWildcard utility to escape special characters in LIKE queries
- **HTTP security**: Configure server timeouts and add security headers middleware
- **Rate limiting**: Refactor to support configurable duration and per-endpoint rate limits for auth routes
- **Error handling**: Standardize error responses using HandleError and proper error types

internal/repository/verification_repo.go

@@ -2,6 +2,7 @@
 
 import (
 	"with_you/internal/model"
+	"with_you/internal/pkg/utils"
 
 	"gorm.io/gorm"
 )
@@ -69,9 +70,10 @@ func (r *verificationRepository) List(page, pageSize int, status, keyword string
 	}
 
 	if keyword != "" {
+		kw := "%" + utils.EscapeLikeWildcard(keyword) + "%"
 		query = query.Joins("JOIN users ON users.id = verification_records.user_id").
 			Where("users.username LIKE ? OR users.nickname LIKE ? OR verification_records.real_name LIKE ?",
-				"%"+keyword+"%", "%"+keyword+"%", "%"+keyword+"%")
+				kw, kw, kw)
 	}
 
 	query.Count(&total)