Update API service to use raw_waiting_time table

- Change RawOpdCheckpoint model to RawWaitingTime
- Update schema from FeedCheckpointIn to FeedWaitingTimeIn
- Switch to rawdata.raw_waiting_time table
- Keep existing /feed/checkpoint endpoint
- Add new fields: vn, txn, name, doctor_code, doctor_name, location_code, location_name, step_name, time
- Update permission to feed.waiting-time:write

03-apiservice-v0.1/README.md

@@ -0,0 +1,13 @@
+# 03-apiservice: Custom FastAPI Service
+
+## Build & Start
+```bash
+docker compose --env-file ../.env.global up --build -d
+```
+
+## Access
+Internal only - access via Nginx Proxy Manager at `/apiservice`
+
+## Admin UI
+- Login: http://<domain>/apiservice/admin/
+- Generate API Key: POST /apiservice/admin/api-keys/generate