Merge pull request #4702 from ChatGPTNextWeb/feat/gemini-flash

feat: support gemini flash

app/constant.ts

@@ -155,6 +155,7 @@ const openaiModels = [
 const googleModels = [
   "gemini-1.0-pro",
   "gemini-1.5-pro-latest",
+  "gemini-1.5-flash-latest",
   "gemini-pro-vision",
 ];