feat: Add ContextKeyLocalCountTokens and update ResponseText2Usage to use context in multiple channels

setting/ratio_setting/model_ratio.go

@@ -598,6 +598,11 @@ func getHardcodedCompletionModelRatio(name string) (float64, bool) {
 			return 2.5 / 0.3, false
 		} else if strings.HasPrefix(name, "gemini-robotics-er-1.5") {
 			return 2.5 / 0.3, false
+		} else if strings.HasPrefix(name, "gemini-3-pro") {
+			if strings.HasPrefix(name, "gemini-3-pro-image") {
+				return 60, false
+			}
+			return 6, false
 		}
 		return 4, false
 	}