[verified] feat: add live river dashboard

Add mapped river and ThaiWater sensor layers, PostgreSQL history charts, API endpoints, and dashboard tests.

.env.example

@@ -48,6 +48,8 @@ MYSQL_CONNECTION_STRING=mysql://user:password@localhost:3306/ping_river_monitori
 API_HOST=0.0.0.0
 API_PORT=8000
 API_WORKERS=1
+# Public ThaiWater API key used to add Ping-basin water-level sensors.
+THAIWATER_API_KEY=
 
 # Data Collection Settings
 SCRAPING_INTERVAL_HOURS=1