chore: add robots.txt + update index

Author: k9mil

frontend/index.html

@@ -16,6 +16,10 @@
 
   <meta name="description" content="The smartest way to plan your day. Speak naturally and get perfectly organized calendars with zero manual work. AI-powered scheduling for developers and students.">
 
+  <link rel="canonical" href="https://allocate.day/">
+
+  <meta property="og:site_name" content="allocate">
+  <meta property="og:locale" content="en_US">
   <meta property="og:title" content="allocate — Plan Your Day in Seconds with AI">
   <meta property="og:description" content="The smartest way to plan your day. Speak naturally and get perfectly organized calendars with zero manual work. AI-powered scheduling for developers and students.">
   <meta property="og:url" content="https://allocate.day/">

frontend/public/robots.txt

@@ -0,0 +1,3 @@
+User-agent: *
+Allow: /$
+Disallow: /