feat(schematics): add schematic search/build with Playwright browser support

Switch Docker base image from node:22-alpine to Playwright Noble for
in-container Chromium support. Add persistent cache volume for schematics.
New files: schematics browser, cache, Java block ID mapping.

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

docker-compose.yml

@@ -9,4 +9,9 @@ services:
       - WS_PORT=3001
       - MCP_PORT=3002
       - NODE_ENV=production
+    volumes:
+      - schematic-cache:/app/cache
     restart: unless-stopped
+
+volumes:
+  schematic-cache: