feat: scaffold Hono server with auth and health check

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/Dockerfile

@@ -0,0 +1,12 @@
+FROM oven/bun:1
+
+WORKDIR /app
+
+COPY packages/shared ./packages/shared
+COPY server ./server
+
+WORKDIR /app/server
+RUN bun install
+
+EXPOSE 8080
+CMD ["bun", "src/index.ts"]