feat(规则匹配): 事件名支持通配符匹配

Motivation:
通知规则的事件名此前仅支持精确匹配，无法用一条规则覆盖多类事件（如 trade.* 下的全部交易事件），规则配置维护成本高。本次引入通配符匹配，让规则可按模式批量命中事件，同时保证精确规则优先。

Changes:

* 事件名支持 * 和 ? 通配符匹配
* 匹配优先级：精确匹配 > 更具体的通配 > 泛匹配，同分时取更小 ID
* 精确命中未命中时回退为列出源下启用规则并按优先级挑选
* 抽取缓存预热逻辑为独立方法
* 更新文档说明事件名通配规则

internal/engine/matcher.go

@@ -33,28 +33,38 @@ func (m *Matcher) Match(ctx context.Context, sourceID int, event string) (*model
 		}
 	}
 
-	// Fall back to DB
 	rule, err := m.store.GetRuleBySourceEvent(ctx, sourceID, event)
 	if err != nil {
-		return nil, fmt.Errorf("match rule: %w", err)
-	}
-
-	// Warm cache
-	if m.cache != nil {
-		tmpl, err := m.store.GetTemplate(ctx, rule.TemplateID)
-		if err != nil {
-			return rule, nil // rule found but template fetch failed — still return rule
-		}
-		cr := &cache.CachedRule{
-			RuleID:     rule.ID,
-			TemplateID: rule.TemplateID,
-			Content:    tmpl.Content,
-		}
-		if rule.Conditions != nil {
-			cr.Conditions = string(*rule.Conditions)
-		}
-		_ = m.cache.SetRule(ctx, sourceID, event, cr)
+		rules, listErr := m.store.ListEnabledRulesBySource(ctx, sourceID)
+		if listErr != nil {
+			return nil, fmt.Errorf("match rule: %w", listErr)
+		}
+		picked := PickEventRule(event, rules)
+		if picked == nil {
+			return nil, fmt.Errorf("match rule: %w", err)
+		}
+		return picked, nil
 	}
 
+	m.warmRuleCache(ctx, sourceID, event, rule)
 	return rule, nil
 }
+
+func (m *Matcher) warmRuleCache(ctx context.Context, sourceID int, event string, rule *model.Rule) {
+	if m.cache == nil {
+		return
+	}
+	tmpl, err := m.store.GetTemplate(ctx, rule.TemplateID)
+	if err != nil {
+		return
+	}
+	cr := &cache.CachedRule{
+		RuleID:     rule.ID,
+		TemplateID: rule.TemplateID,
+		Content:    tmpl.Content,
+	}
+	if rule.Conditions != nil {
+		cr.Conditions = string(*rule.Conditions)
+	}
+	_ = m.cache.SetRule(ctx, sourceID, event, cr)
+}