Update Dockerfile configuration

Dockerfile

@@ -6,35 +6,64 @@ RUN npm ci
 COPY frontend/ ./
 RUN npm run build
 
-# ---------- Backend build ----------
+# ---------- Backend build (build venv only) ----------
 FROM python:3.11-slim AS be
 ENV PIP_NO_CACHE_DIR=1 PYTHONUNBUFFERED=1 PIP_PREFER_BINARY=1
 WORKDIR /app
+
+# 系統相依（供一些科學套件編譯/連結）
 RUN apt-get update && apt-get install -y --no-install-recommends \
-build-essential gcc g++ gfortran make pkg-config \
-libopenblas-dev liblapack-dev git \
-&& rm -rf /var/lib/apt/lists/*
+    build-essential gcc g++ gfortran make pkg-config \
+    libopenblas-dev liblapack-dev git \
+ && rm -rf /var/lib/apt/lists/*
+
+# 建立虛擬環境並啟用
+RUN python -m venv /opt/venv
+ENV PATH="/opt/venv/bin:${PATH}"
+
+# 升級 pip/工具
 RUN python -m pip install --upgrade pip setuptools wheel
+
+# 先裝 CPU 版 torch（避免跟 requirements 衝突）
 RUN pip install --index-url https://download.pytorch.org/whl/cpu "torch==2.3.1"
+
+# 安裝你的後端依賴（移除/忽略裡面的 torch）
 COPY backend/requirements.txt ./backend/requirements.txt
 RUN sed -i 's/^[Tt]orch[[:space:]=<>!].*/# torch pinned separately (CPU)/' backend/requirements.txt || true
+
+# 盡量吃 wheels；若失敗再退而求其次
 RUN pip install --only-binary=:all: blis || echo "Precompiled blis not available"
 RUN pip install -r backend/requirements.txt || pip install -r backend/requirements.txt --no-deps
+
+# 也把 gunicorn 裝進 venv（改用這個，避免 runtime 再裝）
+RUN pip install --no-cache-dir gunicorn
+
+# 可選：把後端程式先帶進來做可用性檢查（不一定需要）
 COPY backend/ ./backend/
 
 # ---------- Runtime ----------
 FROM python:3.11-slim AS runtime
-ENV PYTHONUNBUFFERED=1 PIP_NO_CACHE_DIR=1 PORT=7860
+ENV PYTHONUNBUFFERED=1 PIP_NO_CACHE_DIR=1 PORT=7860 \
+    PATH="/opt/venv/bin:${PATH}" 
+
 WORKDIR /app
+
+# 輕量執行期相依
 RUN apt-get update && apt-get install -y --no-install-recommends \
-nginx supervisor ca-certificates \
-libgomp1 libopenblas0 \
-&& rm -rf /var/lib/apt/lists/*
+    nginx supervisor ca-certificates \
+    libgomp1 libopenblas0 \
+ && rm -rf /var/lib/apt/lists/*
+
+# 前端靜態檔
 COPY --from=fe /app/frontend/dist /usr/share/nginx/html
-COPY --from=be /usr/local /usr/local
+
+# 只拷「虛擬環境」，不要整個 /usr/local
+COPY --from=be /opt/venv /opt/venv
+
+# 後端程式碼
 COPY --from=be /app/backend /app/backend
-RUN python -m pip install --no-cache-dir gunicorn
 
+# nginx 設定與 supervisor
 COPY nginx.conf.template /etc/nginx/nginx.conf
 
 RUN mkdir -p /etc/supervisor/conf.d && \
@@ -52,4 +81,4 @@ stdout_logfile_maxbytes=0\nstderr_logfile_maxbytes=0\n\n\
 > /etc/supervisor/conf.d/app.conf
 
 EXPOSE 7860
-CMD ["/usr/bin/supervisord", "-c", "/etc/supervisor/conf.d/app.conf"]
+CMD ["/usr/bin/supervisord", "-c", "/etc/supervisor/conf.d/app.conf"]