feat: Integrar AuditService en todos los endpoints críticos

- Auth: login, logout, login_failed con registro automático
- Tickets: create, update, delete, assign con old/new values
- Users: create, update, delete con sanitización de passwords
- Stats: implementar top_users con JOIN a tabla users
- Schema: agregar índices compuestos para mejor performance
- Frontend: limpiar logs de debug en viewDetail
- Manejo de errores: audit logs no afectan flujo principal

frontend-internal/src/lib/components/Modal.svelte

@@ -1,8 +1,9 @@
 <script>
-  import { createEventDispatcher, onMount, onDestroy } from 'svelte';
+  import { createEventDispatcher } from 'svelte';
   
   export let open = false;
   export let title = '';
+  export let size = 'lg'; // sm, md, lg, xl, 2xl
   
   const dispatch = createEventDispatcher();
   
@@ -15,6 +16,20 @@
       close();
     }
   }
+  
+  function handleBackdropClick(e) {
+    if (e.target === e.currentTarget) {
+      close();
+    }
+  }
+  
+  const sizeClasses = {
+    sm: 'sm:max-w-sm',
+    md: 'sm:max-w-md',
+    lg: 'sm:max-w-lg',
+    xl: 'sm:max-w-xl',
+    '2xl': 'sm:max-w-2xl'
+  };
 </script>
 
 <svelte:window on:keydown={handleKeydown}/>
@@ -23,21 +38,45 @@
   <div class="fixed inset-0 z-50 overflow-y-auto" aria-labelledby="modal-title" role="dialog" aria-modal="true">
     <div class="flex items-end justify-center min-h-screen px-4 pt-4 pb-20 text-center sm:block sm:p-0">
       
-      <div class="fixed inset-0 transition-opacity bg-gray-500 bg-opacity-75" aria-hidden="true" on:click={close}></div>
+      <!-- Backdrop -->
+      <div 
+        class="fixed inset-0 transition-opacity bg-gray-500 bg-opacity-75" 
+        aria-hidden="true" 
+        on:click={handleBackdropClick}
+      ></div>
 
+      <!-- Center trick -->
       <span class="hidden sm:inline-block sm:align-middle sm:h-screen" aria-hidden="true">&#8203;</span>
 
-      <div class="inline-block px-4 pt-5 pb-4 overflow-hidden text-left align-bottom transition-all transform bg-white rounded-lg shadow-xl sm:my-8 sm:align-middle sm:max-w-lg sm:w-full sm:p-6">
-        <div class="sm:flex sm:items-start">
-          <div class="mt-3 text-center sm:mt-0 sm:ml-4 sm:text-left w-full">
-            <h3 class="text-lg leading-6 font-medium text-gray-900" id="modal-title">
-              {title}
-            </h3>
-            <div class="mt-2 text-sm text-gray-500">
-              <slot />
-            </div>
-          </div>
+      <!-- Modal panel -->
+      <div class="inline-block w-full align-bottom bg-white rounded-lg shadow-xl transform transition-all sm:my-8 sm:align-middle {sizeClasses[size]} sm:w-full">
+        <!-- Header -->
+        <div class="px-6 py-4 border-b border-gray-200 flex items-center justify-between">
+          <h3 class="text-lg font-semibold text-gray-900" id="modal-title">
+            {title}
+          </h3>
+          <button 
+            type="button"
+            on:click={close}
+            class="text-gray-400 hover:text-gray-500 focus:outline-none focus:ring-2 focus:ring-primary-500 rounded-lg p-1"
+          >
+            <svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+              <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M6 18L18 6M6 6l12 12" />
+            </svg>
+          </button>
         </div>
+        
+        <!-- Body -->
+        <div class="px-6 py-4 max-h-[70vh] overflow-y-auto">
+          <slot />
+        </div>
+        
+        <!-- Footer (optional) -->
+        {#if $$slots.footer}
+          <div class="px-6 py-4 bg-gray-50 border-t border-gray-200 rounded-b-lg">
+            <slot name="footer" />
+          </div>
+        {/if}
       </div>
     </div>
   </div>

frontend-internal/src/routes/audit/+page.svelte

@@ -825,7 +825,7 @@
 
 <!-- Modal de Detalle -->
 {#if showDetailModal && selectedLog}
-  <Modal title="Detalle del Registro de Auditoría" on:close={() => showDetailModal = false}>
+  <Modal open={showDetailModal} size="2xl" title="Detalle del Registro de Auditoría" on:close={() => showDetailModal = false}>
     <div class="space-y-4">
       <!-- Información General -->
       <div>