feat: consolidate backend and docker-compose setup

backend/Dockerfile

@@ -0,0 +1,82 @@
+# Stage 0: GPU Base image
+FROM nvidia/cuda:12.6.0-devel-ubuntu22.04 AS base-gpu
+
+ENV DEBIAN_FRONTEND=noninteractive
+ENV PATH="/root/.local/bin:$PATH"
+
+# Install system dependencies (libgl and libglib are required for OpenCV)
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    curl \
+    git \
+    libgl1 \
+    libglib2.0-0 \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install uv
+RUN curl -LsSf https://astral.sh/uv/install.sh | sh
+
+# --- vLLM Server Stage ---
+FROM base-gpu AS vllm-server
+WORKDIR /app
+
+# Install project dependencies
+COPY pyproject.toml uv.lock ./
+RUN uv python pin 3.12 && uv sync --frozen --no-dev
+
+# Install prebuilt flash-attention wheel
+ARG FLASH_ATTN_WHEEL=https://github.com/mjun0812/flash-attention-prebuild-wheels/releases/download/v0.3.14/flash_attn-2.8.2+cu128torch2.8-cp312-cp312-linux_x86_64.whl
+RUN uv pip install --python .venv "${FLASH_ATTN_WHEEL}"
+
+COPY . /app
+RUN chmod +x /app/scripts/serve.sh
+
+EXPOSE 8118
+CMD ["./scripts/serve.sh"]
+
+# --- Pipeline API Stage ---
+FROM base-gpu AS pipeline-api
+WORKDIR /app
+
+# Build paddlepaddle and paddlex virtual env
+RUN uv venv .venv-api --python 3.12
+RUN uv pip install --python .venv-api paddlepaddle-gpu -i https://www.paddlepaddle.org.cn/packages/stable/cu126/
+RUN uv pip install --python .venv-api "paddleocr[doc-parser]>=3.3.0"
+RUN uv pip install --python .venv-api "aiohttp>=3.9" "filetype>=1.2" "fastapi>=0.110" "starlette>=0.36" "uvicorn>=0.16" "ultralytics>=8.0"
+
+COPY . /app
+RUN chmod +x /app/scripts/serve-pipeline.sh
+
+EXPOSE 8090
+CMD ["./scripts/serve-pipeline.sh"]
+
+# --- Gradio UI Stage ---
+FROM python:3.12-slim AS gradio-ui
+WORKDIR /app/PaddleOCR-VL-1.6_Online_Demo
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY PaddleOCR-VL-1.6_Online_Demo/requirements.txt ./
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY PaddleOCR-VL-1.6_Online_Demo ./
+
+EXPOSE 7870
+
+ENV GRADIO_SERVER_NAME="0.0.0.0"
+ENV GRADIO_SERVER_PORT="7870"
+
+CMD ["python", "app.py"]
+
+# --- Next.js Web App Stage ---
+FROM node:20-slim AS pfm-web-app
+WORKDIR /app
+COPY pfm-web-app/package.json pfm-web-app/package-lock.json ./
+RUN npm ci
+COPY pfm-web-app/ ./
+ENV NODE_ENV=production
+RUN npm run build
+EXPOSE 3000
+CMD ["npm", "start"]
+