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/config.json

@@ -0,0 +1,11 @@
+{
+  "$schema": "https://unpkg.com/@changesets/config@3.1.3/schema.json",
+  "changelog": "@changesets/cli/changelog",
+  "commit": false,
+  "fixed": [],
+  "linked": [],
+  "access": "restricted",
+  "baseBranch": "base",
+  "updateInternalDependencies": "patch",
+  "ignore": []
+}