chore: фронт :3107, API :3001 (Docker, Vite, CORS, доки)

- compose: testing-web 3107:80, testing-backend 3001:3001, PORT+FRONTEND_URL
- nginx → testing-backend:3001; Vite 3107, proxy /api → 3001
- server default PORT 3001; Dockerfile EXPOSE 3001; CORS dev — localhost:3107
- README, журнал, user guide

Made-with: Cursor

backend/.env.example

@@ -24,6 +24,9 @@ DATABASE_URL=postgresql://hr_bot_user:hrbot123@localhost:5432/clinic_tests
 
 JWT_SECRET=change_me_in_production
 
+# Порт HTTP API (как в docker-compose: 3001)
+# PORT=3001
+
 # A.1: HR login (Werkzeug password, staff by web_login = username в public.users)
 # В Docker (docker-compose.dev.yml) по умолчанию HR_AUTH=1 и HR_DATABASE_URL на hr_bot_test.
 # HR_AUTH=1