feat: add feishu multi-user auth

deploy/.env.production.example

@@ -15,6 +15,17 @@ WEB_AUTH_PASSWORD=
 WEB_AUTH_SESSION_SECRET=
 WEB_AUTH_COOKIE_NAME=skg_marketing_session
 WEB_AUTH_COOKIE_SECURE=true
+AUTH_DATA_ISOLATION_ENABLED=true
+
+# Feishu OAuth login. Register this callback in the Feishu developer console:
+# https://marketing.skg.com/api/auth/feishu/callback
+FEISHU_APP_ID=
+FEISHU_APP_SECRET=
+FEISHU_REDIRECT_URI=https://marketing.skg.com/api/auth/feishu/callback
+FEISHU_OAUTH_SCOPE=
+FEISHU_ALLOWED_EMAIL_DOMAINS=
+FEISHU_ALLOWED_EMAILS=
+FEISHU_ALLOWED_TENANT_KEYS=
 
 # SKG AI gateway, OpenAI-compatible
 LLM_BASE_URL=https://ai.skg.com/ezlink/v1