Fix maxOutputTokens too low for gemini-3.5-flash thinking model

gemini-3.5-flash uses thinking tokens that share the same budget as output
tokens. With maxOutputTokens=200 (vision) or 100 (intent), the model would
exhaust the budget on thinking (~288-1043 tokens) and truncate the actual
response to 8-11 tokens, producing garbage output like "040825".

Fix: 2048 for vision (needs full JSON), 1024 for intent, 512 for connection test.

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

app/Services/GeminiVisionService.php

@@ -34,7 +34,7 @@ class GeminiVisionService
 
         $body  = [
             'contents'         => $contents,
-            'generationConfig' => ['temperature' => 0.1, 'maxOutputTokens' => 200],
+            'generationConfig' => ['temperature' => 0.1, 'maxOutputTokens' => 2048],
         ];
 
         $inicio    = microtime(true);