refactor: split backend into standalone server project

Remove embedded frontend and workflow editor assets, add standalone API deployment configuration, and retain the current backend service updates.

docker/agent-desk-lancedb.yaml

@@ -2,14 +2,15 @@ language: zh-CN
 
 server:
   port: 8083
+  frontendUrl: http://127.0.0.1:3000
   cors:
     allowedOrigins:
-      - http://localhost:8083
-      - http://127.0.0.1:8083
+      - http://localhost:3000
+      - http://127.0.0.1:3000
 
 db:
-  type: mysql
-  dsn: cs_ai_agent:cs_ai_agent_password@tcp(mysql:3306)/cs_ai_agent?charset=utf8mb4&parseTime=True&loc=Local
+  type: postgres
+  dsn: host=host.docker.internal user=cs_ai_agent password=cs_ai_agent_password dbname=cs_ai_agent port=5432 sslmode=disable TimeZone=Asia/Shanghai
 
 logger:
   level: info
@@ -26,7 +27,7 @@ storage:
   maxUploadSizeMB: 5
   local:
     root: /app/data/storage
-    baseUrl: /storage
+    baseUrl: http://127.0.0.1:8083/storage
   oss:
     endpoint: ""
     bucket: ""