feat: add admin verification template with secret code input

app/templates/admin/verify.html

@@ -0,0 +1,34 @@
+{% extends "base.html" %}
+
+{% block content %}
+<div class="max-w-7xl mx-auto px-4 sm:px-6">
+    <div class="min-h-[70vh] flex flex-col justify-center">
+        <div class="text-center mb-12">
+            <h1 class="font-display text-6xl font-bold tracking-tight mb-4">
+                <span class="bg-gradient-to-r from-purple-400 to-pink-500 bg-clip-text text-transparent">
+                    Admin Access
+                </span>
+            </h1>
+            <p class="font-mono text-gray-400">Enter secret code to verify</p>
+        </div>
+        
+        <form method="POST" class="glass p-8 rounded-2xl max-w-md mx-auto">
+            <div class="mb-6">
+                <label class="block font-mono text-sm text-gray-400 mb-2">Secret Code</label>
+                <input type="password" name="code" required
+                    class="w-full bg-white/5 border border-white/10 rounded-xl px-4 py-3 font-mono focus:outline-none focus:border-purple-500 transition">
+            </div>
+            
+            <button type="submit" class="w-full btn-magnetic glass px-6 py-4 rounded-xl font-mono font-semibold border-2 border-purple-500/50 hover:border-purple-400 animate-glow">
+                Verify
+            </button>
+        </form>
+        
+        <div class="text-center mt-6">
+            <a href="{{ url_for('main.index') }}" class="font-mono text-sm text-gray-400 hover:text-blue-400 transition">
+                Back to Home
+            </a>
+        </div>
+    </div>
+</div>
+{% endblock %}