feat: channel affinity (#2669)

* feat: channel affinity

* feat: channel affinity -> model setting

* fix: channel affinity

* feat: channel affinity op

* feat: channel_type setting

* feat: clean

* feat: cache supports both memory and Redis.

* feat: Optimise ui/ux

* feat: Optimise ui/ux

* feat: Optimise codex usage ui/ux

* feat: Optimise ui/ux

* feat: Optimise ui/ux

* feat: Optimise ui/ux

* feat: If the affinitized channel fails and a retry succeeds on another channel, update the affinity to the successful channel

controller/channel_affinity_cache.go

@@ -0,0 +1,60 @@
+package controller
+
+import (
+	"net/http"
+	"strings"
+
+	"github.com/QuantumNous/new-api/service"
+	"github.com/gin-gonic/gin"
+)
+
+func GetChannelAffinityCacheStats(c *gin.Context) {
+	stats := service.GetChannelAffinityCacheStats()
+	c.JSON(http.StatusOK, gin.H{
+		"success": true,
+		"message": "",
+		"data":    stats,
+	})
+}
+
+func ClearChannelAffinityCache(c *gin.Context) {
+	all := strings.TrimSpace(c.Query("all"))
+	ruleName := strings.TrimSpace(c.Query("rule_name"))
+
+	if all == "true" {
+		deleted := service.ClearChannelAffinityCacheAll()
+		c.JSON(http.StatusOK, gin.H{
+			"success": true,
+			"message": "",
+			"data": gin.H{
+				"deleted": deleted,
+			},
+		})
+		return
+	}
+
+	if ruleName == "" {
+		c.JSON(http.StatusBadRequest, gin.H{
+			"success": false,
+			"message": "缺少参数：rule_name，或使用 all=true 清空全部",
+		})
+		return
+	}
+
+	deleted, err := service.ClearChannelAffinityCacheByRuleName(ruleName)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{
+			"success": false,
+			"message": err.Error(),
+		})
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{
+		"success": true,
+		"message": "",
+		"data": gin.H{
+			"deleted": deleted,
+		},
+	})
+}