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/.vscode/extensions.json

@@ -0,0 +1,15 @@
+{
+  "recommendations": [
+    "vue.volar",
+    "dbaeumer.vscode-eslint",
+    "antfu.unocss",
+    "antfu.iconify",
+    "evils.uniapp-vscode",
+    "uni-helper.uni-helper-vscode",
+    "uni-helper.uni-app-schemas-vscode",
+    "uni-helper.uni-highlight-vscode",
+    "uni-helper.uni-ui-snippets-vscode",
+    "uni-helper.uni-app-snippets-vscode",
+    "streetsidesoftware.code-spell-checker"
+  ]
+}