feat(config): add sensitive word filtering system with database support

Implement sensitive word filtering feature with configurable database and Redis
support. Add security enhancements including WebSocket origin validation, improved
password strength requirements, timing attack prevention, and production JWT secret
validation. Add batch operation validation limits and optimize user blocking
queries with subqueries.

BREAKING CHANGE: Password validation now requires minimum 8 characters with uppercase,
lowercase, and digit (was 6-50 characters without complexity requirements)

internal/repository/group_repo.go

@@ -492,7 +492,7 @@ func (r *groupRepository) GetGroupsByCursor(ctx context.Context, req *cursor.Pag
 
 	if builder.Error() != nil {
 		// 无效游标，返回空列表
-		return cursor.NewCursorPageResult[*model.Group]([]*model.Group{}, "", "", false), nil
+		return cursor.NewCursorPageResult([]*model.Group{}, "", "", false), nil
 	}
 
 	// 执行查询
@@ -551,7 +551,7 @@ func (r *groupRepository) GetUserGroupsByCursor(ctx context.Context, userID stri
 
 	if builder.Error() != nil {
 		// 无效游标，返回空列表
-		return cursor.NewCursorPageResult[*model.Group]([]*model.Group{}, "", "", false), nil
+		return cursor.NewCursorPageResult([]*model.Group{}, "", "", false), nil
 	}
 
 	// 执行查询
@@ -605,7 +605,7 @@ func (r *groupRepository) GetMembersByCursor(ctx context.Context, groupID string
 
 	if builder.Error() != nil {
 		// 无效游标，返回空列表
-		return cursor.NewCursorPageResult[*model.GroupMember]([]*model.GroupMember{}, "", "", false), nil
+		return cursor.NewCursorPageResult([]*model.GroupMember{}, "", "", false), nil
 	}
 
 	// 执行查询
@@ -660,7 +660,7 @@ func (r *groupRepository) GetAnnouncementsByCursor(ctx context.Context, groupID
 
 	if builder.Error() != nil {
 		// 无效游标，返回空列表
-		return cursor.NewCursorPageResult[*model.GroupAnnouncement]([]*model.GroupAnnouncement{}, "", "", false), nil
+		return cursor.NewCursorPageResult([]*model.GroupAnnouncement{}, "", "", false), nil
 	}
 
 	// 执行查询（置顶的排在前面）