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>

package.json

@@ -11,6 +11,9 @@
   "dependencies": {
     "@modelcontextprotocol/sdk": "^1.27.1",
     "express": "^4.21.2",
+    "minecraft-data": "^3.105.0",
+    "playwright": "^1.58.2",
+    "prismarine-schematic": "^1.2.3",
     "ws": "^8.18.0",
     "zod": "^3.25.0"
   },