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/service/comment_service.go

@@ -6,6 +6,7 @@ import (
 	"log"
 	"strings"
 
+	apperrors "with_you/internal/errors"
 	"with_you/internal/cache"
 	"with_you/internal/dto"
 	"with_you/internal/model"
@@ -299,16 +300,22 @@ func (s *CommentService) GetReplies(ctx context.Context, parentID string) ([]*mo
 }
 
 // Update 更新评论
-func (s *CommentService) Update(ctx context.Context, comment *model.Comment) error {
+func (s *CommentService) Update(ctx context.Context, userID string, comment *model.Comment) error {
+	if comment.UserID != userID {
+		return apperrors.ErrForbidden
+	}
 	return s.commentRepo.Update(comment)
 }
 
 // Delete 删除评论
-func (s *CommentService) Delete(ctx context.Context, id string) error {
+func (s *CommentService) Delete(ctx context.Context, userID string, id string) error {
 	comment, err := s.commentRepo.GetByID(id)
 	if err != nil {
 		return err
 	}
+	if comment.UserID != userID {
+		return apperrors.ErrForbidden
+	}
 	if err := s.commentRepo.Delete(id); err != nil {
 		return err
 	}