Update environment configuration and enhance API endpoints

- Changed ANALYSIS_SERVICE_URL to localhost for local development.
- Updated ANALYSIS_AUTH_TOKEN and APP_ID for improved security.
- Added new functions in endpoints.py for form extraction and stage code normalization.
- Enhanced chat handling to support form updates and improved event streaming.
- Updated models to include new fields for form update handling.

test/api/fastapi.http

@@ -3,27 +3,28 @@
 GET http://127.0.0.1:8080
 
 HTTP/1.1 200  - OK
-connection: close
+date: Wed, 17 Jun 2026 00:37:02 GMT
+server: uvicorn
 content-length: 32
 content-type: application/json
-date: Thu, 08 Jan 2026 08:58:09 GMT
-server: uvicorn
+connection: close
 ###
 POST http://127.0.0.1:8080/chat
 content-type: application/json
 
 {
-    "sessionId": "a1002",
+    "sessionId": "a1100",
     "timeStamp": "202503310303",
-    "text": "【拍摄完成】"
+    "text": "继续",
+    "needFormTags": true
 }
 
 HTTP/1.1 200  - OK
-connection: close
-content-length: 205
-content-type: application/json
-date: Thu, 08 Jan 2026 08:59:37 GMT
+date: Wed, 17 Jun 2026 00:37:26 GMT
 server: uvicorn
+content-length: 274
+content-type: application/json
+connection: close
 ###
 POST http://127.0.0.1:8080/get_info
 content-type: application/json
@@ -35,11 +36,11 @@ content-type: application/json
 }
 
 HTTP/1.1 200  - OK
-connection: close
-content-length: 97
-content-type: application/json
-date: Thu, 08 Jan 2026 09:27:05 GMT
+date: Wed, 17 Jun 2026 00:27:12 GMT
 server: uvicorn
+content-length: 108
+content-type: application/json
+connection: close
 ###
 POST http://127.0.0.1:8080/set_info
 content-type: application/json