feat: Implement email functionality with FastAPI-Mail and Mailhog

- Updated docker-compose.yml to include Mailhog service for email testing.
- Added environment variables for email configuration in docker-compose.
- Updated requirements.txt to include fastapi-mail for email support.
- Created templates for password reset, email verification, and welcome emails.
- Developed mail utility module to handle sending emails using FastAPI-Mail.
- Added documentation for email testing with Mailhog.

app/templates/auth/registration_success.html

@@ -5,7 +5,18 @@
     <div class="text-center">
       <i class="fas fa-check-circle text-green-500 text-5xl mb-4"></i>
       <h1 class="text-2xl font-bold text-irish-green mb-3">Registration Successful!</h1>
-      <p class="text-gray-600 mb-6">Your account has been created successfully.</p>
+      
+      {% if email_verification_required %}
+        <p class="text-gray-600 mb-4">Your account has been created successfully.</p>
+        <div class="bg-blue-50 p-4 rounded-md mb-6">
+          <p class="text-blue-800">
+            <i class="fas fa-envelope mr-2"></i>
+            Please check your email inbox to verify your email address before logging in.
+          </p>
+        </div>
+      {% else %}
+        <p class="text-gray-600 mb-6">Your account has been created successfully.</p>
+      {% endif %}
       
       <a href="/auth/login" class="inline-block bg-irish-green text-white py-2 px-6 rounded-md hover:bg-opacity-90 transition">
         Log In