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>

app/Http/Controllers/TelegramWebhookController.php

@@ -31,13 +31,14 @@ class TelegramWebhookController extends Controller
 
         // Voice / audio messages
         if (isset($update['message']['voice']) || isset($update['message']['audio'])) {
-            $chatId = (string) $update['message']['chat']['id'];
-            $fileId = $update['message']['voice']['file_id'] ?? $update['message']['audio']['file_id'];
-            $nombre = trim(
+            $chatId   = (string) $update['message']['chat']['id'];
+            $fileId   = $update['message']['voice']['file_id']   ?? $update['message']['audio']['file_id'];
+            $duration = $update['message']['voice']['duration']   ?? $update['message']['audio']['duration'] ?? null;
+            $nombre   = trim(
                 ($update['message']['from']['first_name'] ?? '') . ' ' .
                 ($update['message']['from']['last_name']  ?? '')
             );
-            $bot->handleVoice($chatId, $fileId, $nombre);
+            $bot->handleVoice($chatId, $fileId, $nombre, (int) $duration);
             return response()->json(['ok' => true]);
         }