build: add Docker deployment — Compose, Dockerfiles, Nginx config

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

backend/Dockerfile

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+FROM python:3.12-slim
+WORKDIR /app
+COPY --from=ghcr.io/astral-sh/uv:latest /uv /usr/local/bin/uv
+COPY pyproject.toml uv.lock ./
+RUN uv sync --frozen --no-dev
+COPY app/ app/
+CMD ["uv", "run", "uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8900"]

docker-compose.yml

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+services:
+  backend:
+    build: ./backend
+    ports:
+      - "8900:8900"
+    volumes:
+      - ${DESIGN_DIR:-.}:/data/design:rw
+      - ${CODE_DIR:-/dev/null}:/data/code:ro
+      - registry-data:/data/registry
+    environment:
+      - REGISTRY_PATH=/data/registry/projects.json
+
+  frontend:
+    build: ./frontend
+    ports:
+      - "80:80"
+    depends_on:
+      - backend
+
+volumes:
+  registry-data:

frontend/Dockerfile

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+FROM node:20-alpine AS build
+WORKDIR /app
+COPY package.json package-lock.json ./
+RUN npm ci
+COPY . .
+RUN npm run build
+
+FROM nginx:alpine
+COPY --from=build /app/dist /usr/share/nginx/html
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+EXPOSE 80

frontend/nginx.conf

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+server {
+    listen 80;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    location /api/ {
+        proxy_pass http://backend:8900;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+    }
+
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+}