feat: add Docker configuration and environment setup for backend and frontend

k-tv-frontend/Dockerfile

@@ -0,0 +1,46 @@
+# ── Stage 1: Install dependencies ────────────────────────────────────────────
+FROM oven/bun:1 AS deps
+
+WORKDIR /app
+
+COPY package.json bun.lock ./
+RUN bun install --frozen-lockfile
+
+# ── Stage 2: Build ────────────────────────────────────────────────────────────
+FROM oven/bun:1 AS builder
+
+WORKDIR /app
+
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+
+# NEXT_PUBLIC_* vars are baked into the client bundle at build time.
+# Pass the public backend URL via --build-arg (see compose.yml).
+ARG NEXT_PUBLIC_API_URL=http://localhost:3000/api/v1
+ENV NEXT_PUBLIC_API_URL=$NEXT_PUBLIC_API_URL
+ENV NEXT_TELEMETRY_DISABLED=1
+
+RUN bun run build
+
+# ── Stage 3: Production runner ────────────────────────────────────────────────
+FROM node:22-alpine AS runner
+
+WORKDIR /app
+
+ENV NODE_ENV=production
+ENV NEXT_TELEMETRY_DISABLED=1
+
+RUN addgroup --system --gid 1001 nodejs \
+ && adduser  --system --uid 1001 nextjs
+
+# standalone output + static assets
+COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
+COPY --from=builder --chown=nextjs:nodejs /app/.next/static     ./.next/static
+
+USER nextjs
+
+EXPOSE 3001
+ENV PORT=3001
+ENV HOSTNAME=0.0.0.0
+
+CMD ["node", "server.js"]