feat: Docker self-hosting setup

- Fix Dockerfiles to copy pnpm-lock.yaml (frozen-lockfile compliance)
- Add migrate target to API Dockerfile using builder stage
- Add migrate service to docker-compose that runs before API starts
- Add AUTH_DISABLED env var bypass to auth middleware for dev/Docker
- Proxy /api/ from nginx to API container (no CORS needed)
- Include initial Drizzle migration (0000_colossal_colossus.sql)
- Add .env.example with all configurable variables
- Update README with Docker self-hosting instructions

Closes #7

Co-authored-by: Groom Book CTO <cto@groombook.app>
Co-authored-by: Paperclip <noreply@paperclip.ing>

apps/web/Dockerfile

@@ -4,7 +4,7 @@ WORKDIR /app
 
 # Install deps
 FROM base AS deps
-COPY package.json pnpm-workspace.yaml ./
+COPY package.json pnpm-workspace.yaml pnpm-lock.yaml ./
 COPY apps/web/package.json apps/web/
 COPY packages/types/package.json packages/types/
 RUN pnpm install --frozen-lockfile