Fix worker rq not found — build venv natively in Playwright image

The Playwright Noble image ships Python 3.12 while the builder uses
python:3.11-slim. Copying the venv produced broken shebangs, causing
"exec /app/.venv/bin/rq: no such file or directory".

Fix: install uv in the worker stage and run uv sync natively so the
venv targets this image's Python version. Manifests copied first for
layer cache efficiency.

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

Dockerfile

@@ -49,6 +49,8 @@ EXPOSE 8000
 CMD ["python", "main.py", "admin"]
 
 # ── Stage 2b: worker runtime (Playwright image with Chromium) ────────────────
+# The Playwright Noble image ships Python 3.12. Copying a venv built with
+# python:3.11-slim would produce broken shebangs — so we build the venv here.
 FROM oci.reg.darano.ir//mcr.microsoft.com/playwright:v1.62.0-noble AS worker
 
 ENV PATH="/app/.venv/bin:$PATH" \
@@ -62,11 +64,15 @@ ENV PATH="/app/.venv/bin:$PATH" \
 
 WORKDIR /app
 
-# Copy application code
-COPY . .
+# Copy manifests + lockfile first (stable cache layer)
+COPY pyproject.toml uv.lock* ./
 
-# Copy Python deps from builder stage
-COPY --from=builder /app/.venv /app/.venv
+# Install deps natively so the venv targets this image's Python
+RUN pip install --no-cache-dir --upgrade uv==0.11.31 \
+    && uv sync --frozen --no-dev --no-install-project
+
+# Copy app code (busts cache on code changes, not deps)
+COPY . .
 
 # Playwright's Chromium is already downloaded and pre-patched with
 # undetected-chromedriver-friendly modifications, so no patch_driver run needed.