chore: seal Design Vision v1 and monorepo scaffold

Archive the differentiated YuXinGu product docs, AI engineering system,
design contract, and Go/Vue scaffold. Next execution prioritizes Cece-parity
over early innovation (see .ai/product/STRATEGY.md).

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/mini-program/app.json

@@ -0,0 +1,8 @@
+{
+  "pages": ["pages/home/index"],
+  "window": {
+    "navigationBarTitleText": "愈心谷",
+    "navigationBarBackgroundColor": "#FFD1C7",
+    "navigationBarTextStyle": "black"
+  }
+}