AIX: fix OpenAI Responses - Tool re-parsing

src/modules/aix/server/dispatch/wiretypes/openai.wiretypes.ts

@@ -1438,10 +1438,11 @@ export namespace OpenAIWire_Responses_Tools {
     search_context_size: z.enum(['low', 'medium', 'high']).optional(),
     user_location: z.object({
       type: z.literal('approximate'),
-      city: z.string().optional(),
-      country: z.string().optional(),
-      region: z.string().optional(),
-      timezone: z.string().optional(),
+      // API echoes these as `null` when unset, not omitted - so .nullish()
+      city: z.string().nullish(),
+      country: z.string().nullish(),
+      region: z.string().nullish(),
+      timezone: z.string().nullish(),
     }).optional(),
     external_web_access: z.boolean().optional(),
   });

src/modules/llms/server/gemini/gemini.models.ts

@@ -72,7 +72,7 @@ const geminiExpFree: ModelDescriptionSchema['chatPrice'] = {
 };
 
 
-// Pricing based on https://ai.google.dev/pricing (Apr 15, 2026)
+// Pricing based on https://ai.google.dev/pricing (Apr 22, 2026)
 
 const gemini31FlashLitePricing: ModelDescriptionSchema['chatPrice'] = {
   input: 0.25, // text/image/video; audio is $0.50 but we don't differentiate yet
@@ -142,7 +142,7 @@ const gemini25ProPreviewTTSPricing: ModelDescriptionSchema['chatPrice'] = {
 
 const gemini31FlashTTSPricing: ModelDescriptionSchema['chatPrice'] = {
   input: 1.00, // text input
-  // output: 20.00, // AUDIO - not ready for audio output yet (as of Apr 15, 2026)
+  // output: 20.00, // AUDIO - not ready for audio output yet (as of Apr 22, 2026)
 };
 
 const geminiRoboticsER16Pricing: ModelDescriptionSchema['chatPrice'] = {