Update Site source

public/manifest.webmanifest

@@ -0,0 +1,15 @@
+{
+  "name": "Life OS · 人生操作系统",
+  "short_name": "Life OS",
+  "description": "A private personal operating system for memories, reflection, and time.",
+  "id": "/",
+  "start_url": "/",
+  "scope": "/",
+  "display": "standalone",
+  "background_color": "#101216",
+  "theme_color": "#111317",
+  "lang": "zh-CN",
+  "icons": [
+    { "src": "/life-os-icon.svg", "sizes": "any", "type": "image/svg+xml", "purpose": "any maskable" }
+  ]
+}