fix: webapp service has no depends_on ponder (#908)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docker-compose.yml

@@ -139,6 +139,9 @@ services:
     restart: unless-stopped
     networks:
       - harb-network
+    depends_on:
+      ponder:
+        condition: service_healthy
     logging: *default-logging
     healthcheck:
       test: ["CMD", "wget", "--spider", "-q", "http://127.0.0.1:5173/"]