Fix Docker build and production server infrastructure

- Add SKIP_ENV_VALIDATION to bypass Zod env check during next build
- Bundle custom server.ts with esbuild so production uses Socket.io
- Create worker entry point (src/worker.ts) with all BullMQ workers
- Add esbuild build scripts for server and worker bundles
- Fix Dockerfile.worker to include its own build stage
- Fix pre-commit hook to work without global pnpm
- Add CLAUDE.md with project conventions and quick reference

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

Dockerfile.worker

@@ -1,15 +1,26 @@
-# Stage 1: Install production dependencies
+# Stage 1: Install dependencies (dev deps needed for esbuild)
 FROM node:20-alpine AS deps
 RUN corepack enable && corepack prepare pnpm@latest --activate
 WORKDIR /app
 COPY package.json pnpm-lock.yaml ./
-RUN pnpm install --frozen-lockfile --prod
+RUN pnpm install --frozen-lockfile --prod=false
 
-# Stage 2: Production runner
-FROM node:20-alpine AS runner
-RUN addgroup --system --gid 1001 nodejs && adduser --system --uid 1001 worker
+# Stage 2: Build the worker bundle
+FROM node:20-alpine AS builder
+RUN corepack enable && corepack prepare pnpm@latest --activate
 WORKDIR /app
 COPY --from=deps /app/node_modules ./node_modules
-COPY dist/worker.js ./worker.js
+COPY . .
+ENV SKIP_ENV_VALIDATION=1
+RUN pnpm build:worker
+
+# Stage 3: Production runner (prod deps only)
+FROM node:20-alpine AS runner
+RUN corepack enable && corepack prepare pnpm@latest --activate
+WORKDIR /app
+COPY package.json pnpm-lock.yaml ./
+RUN pnpm install --frozen-lockfile --prod
+RUN addgroup --system --gid 1001 nodejs && adduser --system --uid 1001 worker
+COPY --from=builder --chown=worker:nodejs /app/dist/worker.js ./worker.js
 USER worker
 CMD ["node", "worker.js"]