fix: Real-ESRGAN install + Cookbook deps-panel crash on the Python 3.14 image (#4694)

* fix(docker): make Real-ESRGAN installable on the Python 3.14 image

realesrgan's deps basicsr/gfpgan/facexlib (unmaintained since 2022) read
their version in setup.py via `exec(...); locals()['__version__']`, which
raises KeyError on Python 3.13+ — PEP 667 made locals() in a function an
independent snapshot that exec() can no longer mutate. That fails the
Cookbook "install realesrgan" sdist build on the python:3.14 base.

Add a `realesrgan-wheels` builder stage that fetches the pinned sdists,
patches get_version() to exec into an explicit namespace dict, and builds
wheels; the final stage installs them --no-deps so a later
`pip install realesrgan` resolves from wheels instead of rebuilding the
broken sdists. torch stays a runtime pull to keep the base image lean.

Also add the runtime libs opencv-python (cv2) needs — libgl1,
libglib2.0-0t64, libxcb1 — which the slim base omits; without them the
install succeeds but `import cv2` dies with
`libxcb.so.1: cannot open shared object file`.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* fix(cookbook): don't let a package's sys.exit() on import hang the deps panel

The local optional-dependency probe imports each package in-process and
catches ImportError / Exception. But a package can call sys.exit() at
import time — e.g. rembg does `sys.exit(1)` when no onnxruntime backend
loads. SystemExit is a BaseException, not Exception, so it escaped the
probe, propagated out of the list_packages endpoint, and hung the whole
Dependencies panel / worker (the UI loads forever).

Catch (Exception, SystemExit) so one broken optional package is reported
as not-usable instead of taking down the panel.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

Dockerfile

@@ -1,3 +1,14 @@
+# ---- builder: patch + build wheels for Real-ESRGAN's broken-on-3.14 deps ----
+# basicsr/gfpgan/facexlib read their version via exec()+locals()['__version__'],
+# which raises KeyError on Python 3.13+ (PEP 667). Build patched wheels here so
+# the final image / Cookbook never has to compile the broken sdists. See
+# docker/build-realesrgan-wheels.sh for the full rationale.
+FROM python:3.14-slim AS realesrgan-wheels
+RUN apt-get update && apt-get install -y --no-install-recommends curl \
+    && rm -rf /var/lib/apt/lists/*
+COPY docker/build-realesrgan-wheels.sh /usr/local/bin/build-realesrgan-wheels.sh
+RUN bash /usr/local/bin/build-realesrgan-wheels.sh /wheels
+
 FROM python:3.14-slim
 
 # System deps. tmux is required by Cookbook for background downloads/serves.
@@ -18,8 +29,18 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     tmux \
     openssh-client \
     gosu \
+    libgl1 \
+    libglib2.0-0t64 \
+    libxcb1 \
     && rm -rf /var/lib/apt/lists/*
 
+# libgl1/libglib2.0-0t64/libxcb1 are runtime shared libs (libGL.so.1,
+# libglib-2.0/libgthread, libxcb.so.1) that opencv-python (cv2) loads. The
+# slim base omits them, so the Cookbook "install realesrgan" path imports cv2
+# and dies with `libxcb.so.1: cannot open shared object file` despite a clean
+# pip install. Using full opencv-python (not -headless) because basicsr/gfpgan/
+# facexlib/realesrgan all depend on the `opencv-python` distribution by name.
+
 # Docker CLI (client only — daemon stays on the host via the
 # /var/run/docker.sock mount). The Debian `docker.io` package ships
 # dockerd but not the client binary on slim, so grab the static client
@@ -46,6 +67,15 @@ COPY requirements.txt requirements-optional.txt ./
 RUN pip install --no-cache-dir -r requirements.txt \
     && if [ "$INSTALL_OPTIONAL" = "true" ]; then pip install --no-cache-dir -r requirements-optional.txt; fi
 
+# Pre-install the patched basicsr/gfpgan/facexlib wheels built in the
+# realesrgan-wheels stage (--no-deps keeps the image lean — torch & friends are
+# pulled only when realesrgan is actually installed). With these dists already
+# satisfied, the Cookbook's plain `pip install realesrgan` resolves them from
+# wheels instead of rebuilding the sdists that fail on Python 3.14.
+COPY --from=realesrgan-wheels /wheels/ /tmp/odysseus-wheels/
+RUN pip install --no-cache-dir --no-deps /tmp/odysseus-wheels/*.whl \
+    && rm -rf /tmp/odysseus-wheels
+
 # Copy app code
 COPY . .