feat: consolidate backend and docker-compose setup

backend/scripts/install-pipeline.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+cd "$ROOT"
+
+unset VIRTUAL_ENV
+
+PYTHON="${PYTHON:-3.12}"
+VENV=".venv-api"
+
+echo "==> Creating PaddleOCR-VL pipeline API env (${VENV}) with Python ${PYTHON}"
+uv venv "${VENV}" --python "${PYTHON}"
+
+echo "==> Installing PaddlePaddle GPU (CUDA 12.6)"
+uv pip install --python "${VENV}" \
+  paddlepaddle-gpu \
+  -i https://www.paddlepaddle.org.cn/packages/stable/cu126/
+
+echo "==> Installing PaddleOCR doc-parser stack"
+uv pip install --python "${VENV}" "paddleocr[doc-parser]>=3.3.0"
+
+echo "==> Installing PaddleX serving dependencies"
+uv pip install --python "${VENV}" \
+  "aiohttp>=3.9" "filetype>=1.2" "fastapi>=0.110" "starlette>=0.36" "uvicorn>=0.16"
+
+echo "==> Done. Start pipeline API with: ./scripts/serve-pipeline.sh"