feat(群级配置): 新增MySQL+Redis持久缓存并接入进群欢迎差异化配置

新增群级插件配置表与服务层，采用MySQL持久化+Redis长期缓存(TTL=-1)；后台新增群级插件配置管理页面与API，支持按群按插件维护JSON配置并在修改后同步回填MySQL和刷新Redis；已将群成员变更监控插件接入该配置，支持欢迎文案与卡片URL等按群差异化。

robot.py

@@ -17,10 +17,12 @@ from base.plugin_common.plugin_registry import PluginRegistry
 from configuration import Config
 from db.connection import DBConnectionManager
 from db.contacts_db import ContactsDBOperator
+from db.group_plugin_config_db import GroupPluginConfigDBOperator
 from db.plugin_schedule_db import PluginScheduleDBOperator
 from db.system_job_db import SystemJobDBOperator
 from utils.system_jobs import SystemJobLoader
 from utils.email_util import EmailSender
+from utils.group_plugin_config_service import GroupPluginConfigService
 from utils.plugin_schedule_manager import PluginScheduleManager
 from utils.revoke.message_auto_revoke import MessageAutoRevoke
 from utils.robot_cmd.robot_command import GroupBotManager, Feature, PermissionStatus
@@ -68,8 +70,14 @@ class Robot:
         self.redis_pool = self.db_manager.redis_pool
 
         self.contacts_db = ContactsDBOperator(self.db_manager)
+        self.group_plugin_config_db = GroupPluginConfigDBOperator(self.db_manager)
         self.plugin_schedule_db = PluginScheduleDBOperator(self.db_manager)
         self.system_job_db = SystemJobDBOperator(self.db_manager)
+        self.group_plugin_config_db.init_tables()
+        self.group_plugin_config_service = GroupPluginConfigService(
+            db_operator=self.group_plugin_config_db,
+            redis_client=self.db_manager.get_redis_connection(),
+        )
         # 初始化联系人管理器
         self.contact_manager = ContactManager.get_instance()
         self.allContacts = {}  # 将在登录后填充
@@ -89,7 +97,8 @@ class Robot:
             "plugin_registry": self.plugin_registry,
             "db_manager": self.db_manager,
             "db_pool": self.db_pool,
-            "redis_pool": self.redis_pool
+            "redis_pool": self.redis_pool,
+            "group_plugin_config_service": self.group_plugin_config_service,
         }
 
         self.plugin_manager = PluginManager(plugin_dir=getattr(self.config, "plugin_dir", "plugins"))