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>

Dockerfile

@@ -1,4 +1,4 @@
-FROM node:22-alpine
+FROM mcr.microsoft.com/playwright/javascript:v1.58.2-noble
 
 WORKDIR /app
 
@@ -7,8 +7,11 @@ RUN npm ci --production 2>/dev/null || npm install --production
 
 COPY src/ ./src/
 
+# Create cache directory owned by pwuser (default user in playwright image)
+RUN mkdir -p /app/cache && chown -R pwuser:pwuser /app/cache
+
 EXPOSE 3001 3002
 
-USER node
+USER pwuser
 
 CMD ["node", "src/index.js"]