Gemini API RLS notes: 3.7-flash now routed to 3.8-flash, 3.5->3.6

Gemini 3.7 Flash deprecation: gemini-3.7-flash is deprecated and has been replaced by gemini-3.8-flash. All requests to gemini-3.7-flash are automatically routed to gemini-3.8-flash.

Gemini 3.5 Flash deprecation: gemini-3.5-flash is deprecated and has been replaced by gemini-3.6-flash. All requests to gemini-3.5-flash are automatically routed to gemini-3.6-flash.