Feature: Agregar footer con licencia MIT y desarrollador

templates/header.php

@@ -131,6 +131,19 @@ $activeLanguages = getActiveLanguages();
             background-color: var(--bs-body-bg);
             color: var(--bs-body-color);
             padding-top: var(--navbar-height);
+            min-height: 100vh;
+            display: flex;
+            flex-direction: column;
+        }
+        
+        .main-content {
+            flex: 1;
+            padding: 1.5rem;
+            width: 100%;
+        }
+        
+        footer {
+            margin-top: auto;
         }
         
         .navbar-military {
@@ -286,11 +299,6 @@ $activeLanguages = getActiveLanguages();
             background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(196, 185, 152, 1)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
         }
         
-        .main-content {
-            padding: 1.5rem;
-            width: 100%;
-        }
-        
         .card {
             background-color: var(--bs-card-bg);
             border: 1px solid var(--military-green);