Bootstrap pip via ensurepip to install uv manager

ensurepip -> pip install uv (package manager) -> uv sync. Uses
python -m pip so no system pip CLI is needed.

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

Dockerfile

@@ -67,12 +67,11 @@ WORKDIR /app
 # Copy manifests + lockfile first (stable cache layer)
 COPY pyproject.toml uv.lock* ./
 
-# Install uv, then build deps natively so the venv targets this image's Python
-# (Playwright Noble ships Python but not uv or pip)
-RUN mkdir -p /root/.local/bin \
-    && curl -LsSf https://astral.sh/uv/install.sh | UV_INSTALL_DIR=/root/.local sh \
-    && /root/.local/bin/uv sync --frozen --no-dev --no-install-project \
-    && ln -sf /root/.local/bin/uv /usr/local/bin/uv
+# Install deps natively so the venv targets this image's Python
+# (Playwright Noble ships Python but not pip/uv in PATH)
+RUN python -m ensurepip --upgrade \
+    && python -m pip install --no-cache-dir --break-system-packages uv==0.11.31 \
+    && uv sync --frozen --no-dev --no-install-project
 
 # Copy app code (busts cache on code changes, not deps)
 COPY . .