feat(token): add batch API for fetching token keys

Add new endpoint POST /api/token/batch/keys to fetch multiple
token keys in a single request, improving performance when
exporting or copying multiple tokens.

- Backend: Add GetTokenKeysBatch controller and GetTokenKeysByIds model
- Backend: Add route with CriticalRateLimit and DisableCache middleware
- Frontend: Add fetchTokenKeysBatch helper function
- Frontend: Update useTokensData to use batch API for token export

controller/token.go

@@ -334,3 +334,26 @@ func DeleteTokenBatch(c *gin.Context) {
 		"data":    count,
 	})
 }
+
+func GetTokenKeysBatch(c *gin.Context) {
+	tokenBatch := TokenBatch{}
+	if err := c.ShouldBindJSON(&tokenBatch); err != nil || len(tokenBatch.Ids) == 0 {
+		common.ApiErrorI18n(c, i18n.MsgInvalidParams)
+		return
+	}
+	if len(tokenBatch.Ids) > 100 {
+		common.ApiErrorI18n(c, i18n.MsgBatchTooMany, map[string]any{"Max": 100})
+		return
+	}
+	userId := c.GetInt("id")
+	tokens, err := model.GetTokenKeysByIds(tokenBatch.Ids, userId)
+	if err != nil {
+		common.ApiError(c, err)
+		return
+	}
+	keysMap := make(map[int]string)
+	for _, t := range tokens {
+		keysMap[t.Id] = t.GetFullKey()
+	}
+	common.ApiSuccess(c, gin.H{"keys": keysMap})
+}