feat(17-02): Dockerfile three-stage build, .dockerignore, .env.production.example

- Three-stage node:20-slim Dockerfile with --platform=linux/amd64 on all 3 FROM lines
- Non-root nextjs:nodejs user, seeds/ copied for form library, uploads/ dir pre-created
- HEALTHCHECK via wget pointing to /api/health, CMD node server.js
- .dockerignore excludes node_modules, .next, .git, .env*, uploads/, *.md
- .env.production.example with exactly 11 required vars (template, no real secrets, force-added past .env* glob)

teressa-copeland-homes/Dockerfile

@@ -0,0 +1,42 @@
+# Stage 1: Install production dependencies
+FROM --platform=linux/amd64 node:20-slim AS deps
+WORKDIR /app
+COPY package.json package-lock.json ./
+RUN npm ci --omit=dev
+
+# Stage 2: Build the application
+FROM --platform=linux/amd64 node:20-slim AS builder
+WORKDIR /app
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+ENV NODE_ENV=production
+RUN npm run build
+
+# Stage 3: Production runner
+FROM --platform=linux/amd64 node:20-slim AS runner
+WORKDIR /app
+ENV NODE_ENV=production
+ENV PORT=3000
+ENV HOSTNAME=0.0.0.0
+
+RUN addgroup --system --gid 1001 nodejs && \
+    adduser --system --uid 1001 nextjs
+
+# Copy standalone server and static assets
+COPY --from=builder --chown=nextjs:nodejs /app/public ./public
+COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
+COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
+
+# Copy seeds/forms for form library import feature (runtime dependency)
+COPY --from=builder --chown=nextjs:nodejs /app/seeds ./seeds
+
+# Create uploads directory (will be mounted as volume)
+RUN mkdir -p uploads && chown nextjs:nodejs uploads
+
+USER nextjs
+EXPOSE 3000
+
+HEALTHCHECK --interval=30s --timeout=10s --start-period=15s --retries=3 \
+  CMD wget --no-verbose --tries=1 --spider http://localhost:3000/api/health || exit 1
+
+CMD ["node", "server.js"]