Refactor and remove sqlite and replace with MySQL

web/templates/error/403.html

@@ -0,0 +1,5 @@
+{{ define "content" }}
+<h2 class="text-red-600 text-xl font-bold">🚫 Forbidden</h2>
+<p class="mt-2">You do not have permission to access this page.</p>
+<a href="/" class="text-blue-500 underline mt-4 inline-block">Return to Home</a>
+{{ end }}

web/templates/error/404.html

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+{{ define "content" }}
+<h2>Not Found</h2> <p>The page doesn't exist.</p>
+{{ end }}

web/templates/error/429.html

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+{{ define "content" }}
+<div class="container py-5 text-center">
+  <h1 class="text-danger">🚫 Too Many Requests</h1>
+  <p>Whoa there! You're making requests too quickly. Please slow down and try again in a moment.</p>
+  <a href="/" class="btn btn-primary mt-3">Back to home</a>
+</div>
+{{ end }}

web/templates/error/500.html

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+{{ define "content" }}
+<div class="container py-5 text-center">
+  <h1 class="display-4 text-danger">500 - Server Error</h1>
+  <p class="lead">Something went wrong on our end. We're working to fix it.</p>
+
+  <div class="mt-4">
+    <i class="bi bi-exclamation-triangle-fill text-warning" style="font-size: 3rem;"></i>
+  </div>
+
+  <p class="mt-4 text-muted">Please try again later or contact support if the issue persists.</p>
+
+  <a href="/" class="btn btn-primary mt-3">Return to Homepage</a>
+</div>
+{{ end }}