Add Catppuccin themes: Mocha, Macchiato, Frappé, Latte variants

backend/templates/register.html

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+{{template "base.html" .}}
+
+{{define "title"}}Register{{end}}
+
+{{define "content"}}
+<div class="container mx-auto px-4 py-8 max-w-md">
+    <h1 class="text-3xl font-bold text-center mb-8">Register</h1>
+    
+    <form hx-post="/api/auth/register" hx-target="#result" hx-swap="innerHTML" class="bg-white p-6 rounded-lg shadow-md">
+        <div class="mb-4">
+            <label class="block text-gray-700 mb-2">Email</label>
+            <input type="email" name="email" class="w-full px-3 py-2 border rounded" required>
+        </div>
+        <div class="mb-4">
+            <label class="block text-gray-700 mb-2">Username</label>
+            <input type="text" name="username" class="w-full px-3 py-2 border rounded" required>
+        </div>
+        <div class="mb-4">
+            <label class="block text-gray-700 mb-2">Password</label>
+            <input type="password" name="password" class="w-full px-3 py-2 border rounded" required>
+        </div>
+        <button type="submit" class="w-full bg-green-500 text-white py-2 rounded hover:bg-green-600">
+            Register
+        </button>
+    </form>
+    
+    <div id="result" class="mt-4 text-center"></div>
+    
+    <p class="text-center mt-4">
+        <a href="/login" class="text-blue-500 hover:underline">Already have an account? Login</a>
+    </p>
+</div>
+{{end}}