Fix channel model length issue

Fixes #691

---

For more details, open the [Copilot Workspace session](https://copilot-workspace.githubnext.com/Calcium-Ion/new-api/issues/691?shareId=XXXX-XXXX-XXXX-XXXX).

controller/channel.go

@@ -274,6 +274,17 @@ func AddChannel(c *gin.Context) {
 		}
 		localChannel := channel
 		localChannel.Key = key
+		// Validate the length of the model name
+		models := strings.Split(localChannel.Models, ",")
+		for _, model := range models {
+			if len(model) > 256 {
+				c.JSON(http.StatusOK, gin.H{
+					"success": false,
+					"message": fmt.Sprintf("模型名称过长: %s", model),
+				})
+				return
+			}
+		}
 		channels = append(channels, localChannel)
 	}
 	err = model.BatchInsertChannels(channels)

model/ability.go

@@ -12,7 +12,7 @@ import (
 
 type Ability struct {
 	Group     string  `json:"group" gorm:"type:varchar(64);primaryKey;autoIncrement:false"`
-	Model     string  `json:"model" gorm:"type:varchar(64);primaryKey;autoIncrement:false"`
+	Model     string  `json:"model" gorm:"type:varchar(256);primaryKey;autoIncrement:false"`
 	ChannelId int     `json:"channel_id" gorm:"primaryKey;autoIncrement:false;index"`
 	Enabled   bool    `json:"enabled"`
 	Priority  *int64  `json:"priority" gorm:"bigint;default:0;index"`

model/cache.go

@@ -181,7 +181,7 @@ func CacheGetRandomSatisfiedChannel(group string, model string, retry int) (*Cha
 	}
 
 	// if memory cache is disabled, get channel directly from database
-	if !common.MemoryCacheEnabled {
+	if (!common.MemoryCacheEnabled) {
 		return GetRandomSatisfiedChannel(group, model, retry)
 	}
 	channelSyncLock.RLock()