fix(cafe24): zip with forward-slash paths (python fallback before Compress-Archive)

On a Windows/Git-Bash build box with no `zip`, the packager fell back to
PowerShell Compress-Archive, which writes BACKSLASH path separators. Cafe24's
extractor (and some unzip tools) do not normalise them, so the app tree unpacked
as flat files (move_detect_app\src\... as a single filename) and the deploy
silently broke — a likely cause of the repeated install failures.

Prefer a Python zipfile step (POSIX arcnames) between `zip` and PowerShell.
Verified: rebuilt zip extracts with a correct move_detect_app/src/... tree and
no "backslashes as path separators" warning.

cloud/deploy/build_cafe24_package.sh

@@ -225,13 +225,30 @@ echo ">> [6/6] zipping"
 rm -f "$ZIP"
 if command -v zip >/dev/null 2>&1; then
   ( cd "$STAGE" && zip -rq "$ZIP" . )
+elif command -v python3 >/dev/null 2>&1; then
+  # No `zip` (common on Windows/Git Bash). Use Python's zipfile with POSIX (forward-slash)
+  # arcnames. PowerShell's Compress-Archive writes BACKSLASH path separators, which Cafe24's
+  # extractor and some unzip tools do NOT normalise — the app tree then unpacks as flat files
+  # (move_detect_app\src\... as one filename) and the deploy silently breaks. Prefer python.
+  ( cd "$STAGE" && python3 - "$ZIP" <<'PY'
+import os, sys, zipfile
+with zipfile.ZipFile(sys.argv[1], "w", zipfile.ZIP_DEFLATED) as z:
+    for root, _dirs, files in os.walk("."):
+        for name in files:
+            full = os.path.join(root, name)
+            arc = os.path.relpath(full, ".").replace(os.sep, "/")   # force forward slashes
+            z.write(full, arc)
+PY
+  )
 elif command -v powershell >/dev/null 2>&1; then
-  # No zip on the box (common on Windows/Git Bash) — PowerShell ships Compress-Archive.
+  # Last resort. Compress-Archive uses backslash separators (see above) — the .htaccess/README
+  # note the operator to extract with a slash-aware tool, or prefer the python path.
   win_stage="$(cygpath -w "$STAGE" 2>/dev/null || echo "$STAGE")"
   win_zip="$(cygpath -w "$ZIP" 2>/dev/null || echo "$ZIP")"
   powershell -NoProfile -Command "Compress-Archive -Path '${win_stage}\\*' -DestinationPath '${win_zip}' -Force"
+  echo "   WARN: archived via Compress-Archive (backslash paths). Verify the host unpacks the tree correctly."
 else
-  echo "   WARN: no zip/powershell — skipping the archive; upload $STAGE/ directly."
+  echo "   WARN: no zip/python3/powershell — skipping the archive; upload $STAGE/ directly."
 fi
 
 echo ""