add unibest app skeleton with checkin and progress pages

- init unibest v4.4.0 base template
- tabbar: 4 tabs (打卡/进度/测算/持仓) with carbon icons
- pages/checkin: daily checklist, streak counter, monthly rate
- pages/progress: asset snapshot, progress bar to 71万 target
- pages/calculator, holdings: placeholder pages (stage 2)
- store/checkin.ts + store/progress.ts with pinia persist
- vite: host 0.0.0.0 for WSL2→Windows browser access

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/.changeset/README.md

@@ -0,0 +1,8 @@
+# Changesets
+
+Hello and welcome! This folder has been automatically generated by `@changesets/cli`, a build tool that works
+with multi-package repos, or single-package repos to help you version and publish your code. You can
+find the full documentation for it [in our repository](https://github.com/changesets/changesets).
+
+We have a quick list of common questions to get you started engaging with this project in
+[our documentation](https://github.com/changesets/changesets/blob/main/docs/common-questions.md).