fix: update scraper dep, add curl for healthcheck, remove stale source

- Update schwab-scraper to f52774b (optimized lot extraction polling,
  faster account switching with selector-based waits)
- Install curl in Docker image so compose healthcheck works
- Remove bundled schwab_scraper/ source (now installed via git dep)
- Increase memory limit to 512M for large account position scraping

compose.yaml

@@ -4,9 +4,22 @@ include:
 services:
   schwab-mcp:
     <<: *mcp-service
-    <<: *mcp-healthcheck
     image: gitea.ext.ben.io/b3nw/schwab-mcp-custom:latest
     container_name: schwab-mcp
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:8000/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 15s
+    deploy:
+      resources:
+        limits:
+          memory: 512M
+          cpus: '1.0'
+        reservations:
+          memory: 128M
+          cpus: '0.1'
     environment:
       - SCHWAB_PLAYWRIGHT_URL=ws://schwab-browser:3000/playwright/chromium
       - PORT=8000