feat: 配置列表分页与钉钉机器人分钟级排队限流

统一 sources/templates/channels/rules 列表为分页响应，避免配置增多时全量返回；按钉钉 access_token 限制每分钟发送并在超限时等待下一分钟，降低触发官方封禁风险。

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/store/template.go

@@ -36,13 +36,19 @@ func (s *Store) GetTemplateByName(ctx context.Context, name string) (*model.Temp
 	return &t, nil
 }
 
-func (s *Store) ListTemplates(ctx context.Context) ([]model.Template, error) {
-	templates := make([]model.Template, 0)
-	err := s.DB.SelectContext(ctx, &templates, `SELECT * FROM notification_template ORDER BY id`)
-	if err != nil {
-		return nil, fmt.Errorf("list templates: %w", err)
+func (s *Store) ListTemplates(ctx context.Context, page PageFilter) ([]model.Template, int, error) {
+	var count int
+	if err := s.DB.GetContext(ctx, &count, `SELECT COUNT(*) FROM notification_template`); err != nil {
+		return nil, 0, fmt.Errorf("count templates: %w", err)
 	}
-	return templates, nil
+
+	page.Normalize()
+	templates := make([]model.Template, 0)
+	err := s.DB.SelectContext(ctx, &templates, `SELECT * FROM notification_template ORDER BY id LIMIT ? OFFSET ?`, page.PageSize, page.Offset())
+	if err != nil {
+		return nil, 0, fmt.Errorf("list templates: %w", err)
+	}
+	return templates, count, nil
 }
 
 func (s *Store) UpdateTemplate(ctx context.Context, id int, t *model.Template) error {