Checkpoint: v4.0 media service, compose deploy, and verified docs

Dockerfile

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+FROM node:22-bookworm-slim AS deps
+WORKDIR /app
+RUN corepack enable
+COPY package.json pnpm-lock.yaml ./
+COPY patches ./patches
+RUN pnpm install --frozen-lockfile
+
+FROM node:22-bookworm-slim AS build
+WORKDIR /app
+RUN corepack enable
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+RUN pnpm build
+
+FROM node:22-bookworm-slim AS runtime
+WORKDIR /app
+ENV NODE_ENV=production
+RUN corepack enable
+COPY package.json pnpm-lock.yaml ./
+COPY patches ./patches
+RUN pnpm install --prod --frozen-lockfile
+COPY --from=build /app/dist ./dist
+EXPOSE 3000
+CMD ["node", "dist/index.js"]