feat: agregar búsqueda de canciones y configurar hook de Gitea Actions

- Agregar componente SearchFilter.client.vue modular y expandible
- Integrar búsqueda en MainContainer con contador de resultados
- Implementar filtrado de canciones por nombre en pages/index.vue
- Configurar hook PostToolUse para monitorear Gitea Actions
- Copiar y adaptar script monitor-gitea-action.sh para repodructor

components/MainContainer.client.vue

@@ -13,6 +13,10 @@
         
         <div class="header-controls">
           <AuthIndicator />
+          <SearchFilter
+            :results-count="filteredCount"
+            @search="$emit('search', $event)"
+          />
           <PlaybackControls
             @shuffle-changed="$emit('shuffle-changed', $event)"
             @repeat-changed="$emit('repeat-changed', $event)"
@@ -38,6 +42,7 @@ import { Music } from 'lucide-vue-next'
 import AuthIndicator from './AuthIndicator.client.vue'
 import ThemeToggle from './ThemeToggle.client.vue'
 import PlaybackControls from './PlaybackControls.client.vue'
+import SearchFilter from './SearchFilter.client.vue'
 
 const props = defineProps({
   currentTrack: {
@@ -47,10 +52,14 @@ const props = defineProps({
   isPlaying: {
     type: Boolean,
     default: false
+  },
+  filteredCount: {
+    type: Number,
+    default: null
   }
 })
 
-defineEmits(['shuffle-changed', 'repeat-changed'])
+defineEmits(['shuffle-changed', 'repeat-changed', 'search'])
 
 // Computed property to determine if there's an active track
 const hasActiveTrack = computed(() => !!props.currentTrack)