refactor: 重构AI聊天服务为流式返回，优化OOS路径与仓库初始化逻辑

1. 重构AI聊天接口与实现为流式返回，支持SSE协议
2. 修正BaseRepository的数据库上下文初始化逻辑
3. 更新AutoDotCodeConsumer的OOS存储路径
4. 新增阿里云OSS配置项到appsettings
5. 优化AiChatService的日志与代码注释

QYZH.InteractiveMagazine.WorkService/appsettings.json

@@ -44,5 +44,17 @@
       }
     ]
   },
-  "AllowedHosts": "*"
+  "AllowedHosts": "*",
+  "AliyunOSSConfigs": {
+    "AccessKeyID": "LTAI5tEBXGewpHSLiSxyx6Bf",
+    "AccessKeySecret": "w29b8wkw6XQVL8GWXgp3ZesgYeDKvf",
+    "VodBucketName": "outin-5277bbb52bec11f08dbd00163e169e2b.oss-cn-beijing.aliyuncs.com",
+    "BucketName": "qyzh2025test",
+    "Region": "beijing",
+    "RoleArn": "acs:ram::1064745380176636:role/aliyunosstokengeneratorrole",
+    "DurationSeconds": 3600, //过期时间(秒)
+    "Endpoint": "oss-cn-beijing.aliyuncs.com",
+    "ProjectName": "InteractiveMagazine",
+    "Domain": "https://oss.test.qyzhjy.com/"
+  }
 }