Add web app manifest, bump version to 0.1.1

manifest.ts uses icon.svg and the app's palette for background/theme
color. Excluded /manifest.webmanifest from the auth gate in proxy.ts,
same as icon.svg/favicon.ico - it must be publicly fetchable regardless
of login state.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01W8WkFF5ppURBAB918593Eb

proxy.ts

@@ -22,5 +22,7 @@ export default async function proxy(req: NextRequest) {
 }
 
 export const config = {
-  matcher: ["/((?!_next/static|_next/image|favicon.ico|icon.svg|login|api/auth/login|api/health).*)"],
+  matcher: [
+    "/((?!_next/static|_next/image|favicon.ico|icon.svg|manifest.webmanifest|login|api/auth/login|api/health).*)",
+  ],
 };