disable thinking budget validation on gemini

src/proxy/google-ai.ts

@@ -189,20 +189,11 @@ googleAIRouter.get("/:apiVersion(v1alpha|v1beta)/models", handleNativeModelReque
 
 /**
  * Processes the thinking budget for Gemini 2.5 Flash model.
- * Ensures the budget is within the valid range of 0-24576 tokens.
+ * Validation has been disabled - budget is passed through without limits.
  */
 function processThinkingBudget(req: Request) {
-  if (req.body.generationConfig?.thinkingConfig?.thinkingBudget !== undefined) {
-    // Ensure thinkingBudget is within allowed range (0-24576)
-    const budget = req.body.generationConfig.thinkingConfig.thinkingBudget;
-    
-    // If it's a number, validate range
-    if (typeof budget === 'number') {
-      req.body.generationConfig.thinkingConfig.thinkingBudget = 
-        Math.max(0, Math.min(budget, 24576));
-    }
-    // If it's "auto", leave as is
-  }
+  // Validation disabled - budget is passed through without any range limits
+  // Previously enforced 0-24576 token limit
 }
 
 function setStreamFlag(req: Request) {