🌐 fix: Support global location for Google VertexAI (danny-avila#7768)

* fix: Check if loc is 'global' and set the endpoint prefix accordingly

* fix: ESLint error

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Co-authored-by: Danny Avila <danny@librechat.ai>

Author: richzw

api/app/clients/GoogleClient.js

@@ -34,7 +34,8 @@ const BaseClient = require('./BaseClient');
 
 const loc = process.env.GOOGLE_LOC || 'us-central1';
 const publisher = 'google';
-const endpointPrefix = `${loc}-aiplatform.googleapis.com`;
+const endpointPrefix =
+  loc === 'global' ? 'aiplatform.googleapis.com' : `${loc}-aiplatform.googleapis.com`;
 
 const settings = endpointSettings[EModelEndpoint.google];
 const EXCLUDED_GENAI_MODELS = /gemini-(?:1\.0|1-0|pro)/;