feat(deploy): add containerized deployment configuration and scripts

- Add Dockerfile for frontend and server services
- Add Docker Compose configs (standard and offline mode)
- Add nginx.conf for admin-web service
- Add deploy scripts: package.sh (packaging) and load-and-start.sh (startup)
- Add deploy/config.yaml, .env.example, and prompts.yml configurations
- Add image management design specification doc

Dockerfile.frontend

@@ -0,0 +1,33 @@
+# syntax=docker/dockerfile:1
+# Build context: repo root (monorepo)
+
+# ─── Stage 1: Build Vue app ────────────────────────────────────────────────────
+FROM node:20-alpine AS builder
+
+RUN npm install -g pnpm@9
+
+WORKDIR /app
+
+# Copy workspace manifests first (cache-friendly)
+COPY package.json pnpm-lock.yaml pnpm-workspace.yaml ./
+COPY packages/shared-types/package.json ./packages/shared-types/
+COPY packages/http-client/package.json ./packages/http-client/
+COPY apps/admin-web/package.json ./apps/admin-web/
+
+RUN pnpm install --frozen-lockfile
+
+# Copy source
+COPY packages/ ./packages/
+COPY apps/admin-web/ ./apps/admin-web/
+
+# Build
+ARG VITE_API_BASE_URL=/api
+RUN pnpm --filter admin-web build
+
+# ─── Stage 2: Serve with nginx ─────────────────────────────────────────────────
+FROM nginx:1.27-alpine
+
+COPY --from=builder /app/apps/admin-web/dist /usr/share/nginx/html
+COPY apps/admin-web/nginx.conf /etc/nginx/conf.d/default.conf
+
+EXPOSE 80