Polish project documentation and runtime config

.env.example

@@ -29,6 +29,17 @@ DEFAULT_TENANT=CityGraph-new2
 DEFAULT_PROJECT=CityGraph-new2
 INGEST_API_KEYS=dev-key-1
 
+# External services, optional
+AMAP_WEB_KEY=
+AMAP_JS_KEY=
+AMAP_SECURITY_JSCODE=
+GAODE_CRAWLER_PATH=
+TRAVEL_KG_DATA_ROOT=./data
+TRAVEL_AGENCY_SOURCE_ROOT=./data/source/travel_agency
+TRAVEL_DELIVERY_ROOT=./data/source/travel_delivery_20260602
+TRAVEL_KG_EXPORT_ROOT=./data/exports
+TRAVEL_KG_ENV_PATH=./.env
+
 # Docker host ports
 API_PORT=8102
 POSTGRES_PORT=5433