基本完成，舒适性修补

backend/api/routes/regexRoute.py

@@ -121,27 +121,61 @@ async def get_preset_ruleset(preset_name: str):
 
 @router.post("/rules")
 async def add_rule(request: RuleUpdateRequest):
-    """添加新规则"""
+    """添加或更新规则"""
     try:
-        regex_service.save_ruleset(
-            RegexRuleset(
+        # 获取现有的规则集
+        existing_ruleset = None
+        if request.scope == RegexScope.GLOBAL:
+            # 对于全局作用域，查找是否已有同名规则集
+            for ruleset_id, ruleset in regex_service.global_rulesets.items():
+                if ruleset.name == request.rule.scriptName:
+                    existing_ruleset = ruleset
+                    break
+        elif request.scope == RegexScope.CHARACTER and request.name:
+            if request.name in regex_service.character_rulesets:
+                existing_ruleset = regex_service.character_rulesets[request.name]
+        elif request.scope == RegexScope.PRESET and request.name:
+            if request.name in regex_service.preset_rulesets:
+                existing_ruleset = regex_service.preset_rulesets[request.name]
+        
+        if existing_ruleset:
+            # 如果已存在同名规则集，则更新其中的规则
+            updated_rules = []
+            rule_found = False
+            for rule in existing_ruleset.rules:
+                if rule.id == request.rule.id:
+                    # 更新现有规则
+                    updated_rules.append(request.rule)
+                    rule_found = True
+                else:
+                    # 保留其他规则
+                    updated_rules.append(rule)
+            
+            if not rule_found:
+                # 如果没有找到相同ID的规则，则添加新规则
+                updated_rules.append(request.rule)
+            
+            # 更新规则集
+            existing_ruleset.rules = updated_rules
+            regex_service.save_ruleset(existing_ruleset, request.scope, request.name)
+        else:
+            # 如果不存在同名规则集，则创建新的规则集
+            new_ruleset = RegexRuleset(
                 id=request.rule.id,
                 name=request.rule.scriptName,
                 rules=[request.rule]
-            ),
-            request.scope,
-            request.name
-        )
+            )
+            regex_service.save_ruleset(new_ruleset, request.scope, request.name)
         
         # 重新加载规则
         regex_service._load_all_rules()
         
         return {
             "success": True,
-            "message": "规则添加成功"
+            "message": "规则保存成功"
         }
     except Exception as e:
-        logger.error(f"添加规则失败: {e}")
+        logger.error(f"保存规则失败: {e}")
         raise HTTPException(status_code=500, detail=str(e))