Add admin user management and improve UX

Features:
- Add user management for admins (CRUD operations)
- Add is_admin column to users table
- Add AdminMiddleware for authorization
- Add admin routes and views
- Add artisan command: user:set-admin

Improvements:
- Fix Quick Switcher: add x-data for Alpine.js dispatch
- Fix Quick Switcher: close on outside click
- Redirect non-admin users to front page after login
- Add Knowledge Base link in dashboard navigation
- Change app logo from Laravel to book icon

src/resources/views/livewire/quick-switcher.blade.php

@@ -1,9 +1,9 @@
 <div
     x-data="{ open: false }"
-    @open-quick-switcher.window="console.log('Event received'); open = true; $nextTick(() => $refs.searchInput.focus())"
+    @open-quick-switcher.window="open = true; $nextTick(() => $refs.searchInput.focus())"
     @keydown.escape.window="open = false"
-    @keydown.ctrl.k.window.prevent="console.log('Ctrl+K pressed'); open = true; $nextTick(() => $refs.searchInput.focus())"
-    @keydown.meta.k.window.prevent="console.log('Cmd+K pressed'); open = true; $nextTick(() => $refs.searchInput.focus())"
+    @keydown.ctrl.k.window.prevent="open = true; $nextTick(() => $refs.searchInput.focus())"
+    @keydown.meta.k.window.prevent="open = true; $nextTick(() => $refs.searchInput.focus())"
 >
     <!-- Modal Overlay -->
     <div
@@ -30,6 +30,7 @@ class="fixed inset-0 z-50 bg-gray-900 bg-opacity-50"
         x-transition:leave-end="opacity-0 translate-y-4"
         class="fixed inset-0 z-50 overflow-y-auto"
         style="display: none;"
+        @click="open = false"
     >
         <div class="flex min-h-full items-start justify-center p-4 pt-[10vh]">
             <div
@@ -54,10 +55,6 @@ class="w-full pl-10 pr-4 py-3 border-0 focus:ring-0 text-lg"
                             autocomplete="off"
                         >
                     </div>
-                    <!-- Debug Info -->
-                    <div class="text-xs text-gray-500 mt-2">
-                        Search value: "{{ $search }}" | Results count: {{ count($this->results) }}
-                    </div>
                 </div>
 
                 <!-- Results -->