fix(endurain): replace Poetry/uv-pip backend setup with uv sync --frozen --no-dev (#15429)

* Initial plan

* fix: remove exclude-newer constraint from pyproject.toml before uv pip install in endurain

* fix(endurain): replace poetry+uv pip with uv sync --frozen --no-dev

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>

ct/endurain.sh

@@ -63,10 +63,7 @@ function update_script() {
     cd /opt/endurain/backend
     UV_VERSION=$(grep -Po 'required-version\s*=\s*"\K[^"]+' pyproject.toml 2>/dev/null || echo "0.11.18")
     UV_VERSION="$UV_VERSION" setup_uv
-    $STD poetry export -f requirements.txt --output requirements.txt --without-hashes
-    $STD uv venv --clear
-    $STD uv pip install -r requirements.txt
-    $STD uv pip install pytz
+    $STD uv sync --frozen --no-dev
     msg_ok "Backend Updated"
 
     msg_info "Starting Service"