Merge upstream v4.5.0 (xmanrui/main) into fix/non-vision-model-image-file-fallback

- CHANGELOG: keep the image-fallback entry under Unreleased alongside the new 4.5.0 section
- harness-client: upstream renameSession coexists with the image-rejection fallback retry path
- lib/index.js rebuilt from merged sources

lib/client.js

@@ -571,7 +571,7 @@ var React23 = __toESM(require("react"), 1);
 // package.json
 var package_default = {
   name: "@xmanrui/dsh-im",
-  version: "4.4.0",
+  version: "4.5.0",
   description: "\u628A\u4E5D\u79CD IM \u673A\u5668\u4EBA\u548C\u516C\u7F51 AI Office \u63A5\u5165\u672C\u673A DeepSeek Harness\u3002 Connect nine IM channels and a public AI Office to a local DeepSeek Harness.",
   keywords: [
     "deepseek-harness",