Add AI usage logs for Gemini and Whisper

- Migration + AiUsageLog model with tokens, duration, time, cost fields
- GeminiIntentService and GeminiVisionService log every API call
  with input/output token counts from usageMetadata and response time
- TelegramBotService logs Whisper calls with audio duration (from Telegram)
  and calculates cost at $1/second
- Whisper voice duration now passed from TelegramWebhookController
- Free text in Telegram now tries Gemini intent detection before showing menu
- /chat/ia-logs: Livewire component with summary cards + filterable table
- Whisper connection test button in config panel
- "Logs IA" link added to Chat/Bot nav section

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

routes/web.php

@@ -99,6 +99,7 @@ Route::middleware(["auth", "solo_usuario_administrador"])->group(function () {
         Route::get('/conversaciones', [ChatController::class, 'conversaciones'])->name('conversaciones');
         Route::get('/menus',          [ChatController::class, 'menus'])->name('menus');
         Route::get('/configuracion',  [ChatController::class, 'configuracion'])->name('configuracion');
+        Route::get('/ia-logs',        [ChatController::class, 'iaLogs'])->name('ia-logs');
     });
 });