Stage: bump the appstore pin to 1.4.5 (uv 0.13.5, LibreChat unchanged at 0.8.8)

Not deployed. Diffed against the official 1.4.5 manifest: version, changelog and
the base-image tag were the only differences, so this copy now matches official
field-for-field except dockerImage (+ our scheduler block).

The risk is the overlay, not the bump: every build-time patch runs against a new
base layer, and they are all non-fatal by design, so a silent no-op is the failure
mode. Verify on the rendered DOM. Rollback = repoint dockerImage to
20261023-65a38bb.

CloudronManifest.json

@@ -1,11 +1,11 @@
 {
     "id": "ai.librechat.cloudronapp",
-    "version": "1.4.1",
+    "version": "1.4.5",
     "title": "LibreChat",
     "upstreamVersion": "0.8.8",
     "author": "Danny Avila",
     "description": "LibreChat is an open-source chatbot client that supports multiple AI providers and models including:\n\n- OpenAI GPT Models\n- Anthropic Claude Models\n- Google PaLM Models\n- Various open-source local models\n\nFeatures:\n- Switch between various AI models\n- Conversation history\n- Plugins support\n- File upload and processing\n- Custom instructions\n- Multiple conversation modes\n\n",
-    "changelog": "* Update uv to 0.13.1\n",
+    "changelog": "* Update uv to 0.13.5\n",
     "tagline": "ChatGPT-like interface with model switching",
     "website": "https://github.com/danny-avila/LibreChat",
     "documentationUrl": "https://docs.cloudron.io/packages/librechat/",