feat(token_estimator): add concurrency support for multipliers retrieval

service/token_estimator.go

@@ -3,6 +3,7 @@ package service
 import (
 	"math"
 	"strings"
+	"sync"
 	"unicode"
 )
 
@@ -31,7 +32,8 @@ type multipliers struct {
 	BasePad    int     // 基础起步消耗 (Start/End tokens)
 }
 
-var multipliersMap = map[Provider]multipliers{
+var (
+	multipliersMap = map[Provider]multipliers{
 		Gemini: {
 			Word: 1.15, Number: 2.8, CJK: 0.68, Symbol: 0.38, MathSymbol: 1.05, URLDelim: 1.2, AtSign: 2.5, Emoji: 1.08, Newline: 1.15, Space: 0.2, BasePad: 0,
 		},
@@ -41,10 +43,15 @@ var multipliersMap = map[Provider]multipliers{
 		OpenAI: {
 			Word: 1.02, Number: 1.55, CJK: 0.85, Symbol: 0.4, MathSymbol: 2.68, URLDelim: 1.0, AtSign: 2.0, Emoji: 2.12, Newline: 0.5, Space: 0.42, BasePad: 0,
 		},
-}
+	}
+	multipliersLock sync.RWMutex
+)
 
 // getMultipliers 根据厂商获取权重配置
 func getMultipliers(p Provider) multipliers {
+	multipliersLock.RLock()
+	defer multipliersLock.RUnlock()
+
 	switch p {
 	case Gemini:
 		return multipliersMap[Gemini]