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>

resources/views/livewire/chat/show-configuracion-chat.blade.php

@@ -109,6 +109,21 @@
                         Habilitar transcripción de audios en Telegram
                     </label>
                 </div>
+                <div>
+                    <button wire:click="resetearWhisper"
+                        class="flex items-center gap-2 px-4 py-2 bg-purple-600 hover:bg-purple-700 text-white text-sm font-semibold rounded-lg transition">
+                        <svg class="w-4 h-4" fill="none" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor">
+                            <path stroke-linecap="round" stroke-linejoin="round" d="M16.023 9.348h4.992v-.001M2.985 19.644v-4.992m0 0h4.992m-4.993 0 3.181 3.183a8.25 8.25 0 0 0 13.803-3.7M4.031 9.865a8.25 8.25 0 0 1 13.803-3.7l3.181 3.182m0-4.991v4.99" />
+                        </svg>
+                        <span wire:loading.remove wire:target="resetearWhisper">Probar conexión Whisper</span>
+                        <span wire:loading wire:target="resetearWhisper">Probando...</span>
+                    </button>
+                    @if($whisperResult)
+                        <p class="mt-2 text-sm {{ str_contains($whisperResult, '✅') ? 'text-emerald-600' : 'text-red-600' }}">
+                            {{ $whisperResult }}
+                        </p>
+                    @endif
+                </div>
             </div>
         </div>