refactor: add modelo do gemini na config e env

.env.example

@@ -45,6 +45,12 @@ PROVIDER_DAILY_PRICE_MIN=18
 
 #
 
+GEMINI_API_KEY=
+
+GEMINI_MODEL=
+
+#
+
 PAGARME_BASE_URL=https://api.pagar.me/core/v5
 
 PAGARME_SECRET_KEY=

app/Services/GeminiService.php

@@ -5,11 +5,12 @@ namespace App\Services;
 use App\Enums\UserTypeEnum;
 use GuzzleHttp\Client;
 use GuzzleHttp\Exception\GuzzleException;
+use GuzzleHttp\Exception\RequestException;
 use Illuminate\Support\Facades\Log;
 
 class GeminiService
 {
-    private const API_URL = 'https://generativelanguage.googleapis.com/v1beta/models/gemini-2.5-flash:generateContent';
+    private const API_BASE_URL = 'https://generativelanguage.googleapis.com/v1beta/models';
 
     private Client $client;
 
@@ -21,6 +22,7 @@ class GeminiService
     public function sendMessage(string $message, UserTypeEnum $userType, array $history = []): string
     {
         $apiKey = config('services.gemini.api_key');
+        $model  = config('services.gemini.model');
         $contents = $this->buildContents($history, $message);
 
         $payload = [
@@ -35,8 +37,9 @@ class GeminiService
         ];
 
         try {
-            $response = $this->client->post(self::API_URL . '?key=' . $apiKey, [
+            $response = $this->client->post($this->buildApiUrl($model), [
                 'json' => $payload,
+                'query' => ['key' => $apiKey],
             ]);
 
             $data = json_decode($response->getBody()->getContents(), true);
@@ -44,12 +47,39 @@ class GeminiService
             return $data['candidates'][0]['content']['parts'][0]['text']
                 ?? __('chatbot.error_response');
         } catch (GuzzleException $e) {
-            Log::error('Gemini API error', ['error' => $e->getMessage()]);
+            $this->logGeminiError($e, $model);
 
             return __('chatbot.error_response');
         }
     }
 
+    private function buildApiUrl(string $model): string
+    {
+        return self::API_BASE_URL . '/' . rawurlencode($model) . ':generateContent';
+    }
+
+    private function logGeminiError(GuzzleException $e, string $model): void
+    {
+        $context = [
+            'model'   => $model,
+            'message' => $this->sanitizeApiKey($e->getMessage()),
+        ];
+
+        if ($e instanceof RequestException && $e->hasResponse()) {
+            $response = $e->getResponse();
+
+            $context['status'] = $response->getStatusCode();
+            $context['body']   = $this->sanitizeApiKey((string) $response->getBody());
+        }
+
+        Log::error('Gemini API error', $context);
+    }
+
+    private function sanitizeApiKey(string $message): string
+    {
+        return preg_replace('/([?&]key=)[^&\s"]+/i', '$1[REDACTED]', $message);
+    }
+
     private function buildContents(array $history, string $newMessage): array
     {
         $contents = [];

config/services.php

@@ -37,6 +37,7 @@ return [
 
     'gemini' => [
         'api_key' => env('GEMINI_API_KEY'),
+        'model'   => env('GEMINI_MODEL'),
     ],
 
     'support' => [