security: externalize BI data source credentials

.env.example

@@ -0,0 +1,42 @@
+# Core asset database
+DB_HOST=
+DB_PORT=3306
+DB_USER=
+DB_PASSWORD=
+DB_NAME=
+
+# Hydrogen ledger database
+HYDROGEN_DB_HOST=
+HYDROGEN_DB_PORT=3306
+HYDROGEN_DB_USER=
+HYDROGEN_DB_PASSWORD=
+HYDROGEN_DB_NAME=
+
+# Mileage reference database
+MILEAGE_DB_HOST=
+MILEAGE_DB_PORT=3306
+MILEAGE_DB_USER=
+MILEAGE_DB_PASSWORD=
+MILEAGE_DB_NAME=
+
+# OneOS mileage API
+ONEOS_MILEAGE_API_BASE_URL=http://172.17.111.55:20310
+ONEOS_MILEAGE_API_KEY=
+ONEOS_MILEAGE_API_TIMEOUT_MS=20000
+
+# Authentication and external API
+EXTERNAL_API_BASE=https://lnh2e.com
+JWT_SECRET=
+DEV_BYPASS_AUTH=0
+
+# Vehicle heatmap database and map SDK
+HEATMAP_DB_HOST=
+HEATMAP_DB_PORT=36453
+HEATMAP_DB_USER=
+HEATMAP_DB_PASSWORD=
+HEATMAP_DB_NAME=lingniu_vehicle_data
+HEATMAP_DB_SSL=false
+AMAP_WEB_KEY=
+AMAP_SECURITY_JS_CODE=
+
+SERVER_PORT=3001