refactor: remove superseded dead code (#5916)

src-tauri/src/proxy/usage/calculator.rs

@@ -112,16 +112,6 @@ impl CostCalculator {
         }
     }
 
-    /// 尝试计算成本，如果模型未知则返回 None
-    #[allow(dead_code)]
-    pub fn try_calculate(
-        usage: &TokenUsage,
-        pricing: Option<&ModelPricing>,
-        cost_multiplier: Decimal,
-    ) -> Option<CostBreakdown> {
-        pricing.map(|p| Self::calculate(usage, p, cost_multiplier))
-    }
-
     pub fn try_calculate_for_app(
         app_type: &str,
         usage: &TokenUsage,
@@ -253,23 +243,6 @@ mod tests {
         assert_eq!(cost.total_cost, Decimal::from_str("0.0045").unwrap());
     }
 
-    #[test]
-    fn test_unknown_model_handling() {
-        let usage = TokenUsage {
-            input_tokens: 1000,
-            output_tokens: 500,
-            cache_read_tokens: 0,
-            cache_creation_tokens: 0,
-            model: None,
-            message_id: None,
-        };
-
-        let multiplier = Decimal::from_str("1.0").unwrap();
-        let cost = CostCalculator::try_calculate(&usage, None, multiplier);
-
-        assert!(cost.is_none());
-    }
-
     #[test]
     fn test_decimal_precision() {
         let usage = TokenUsage {