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

pkg/cachex/namespace.go

@@ -0,0 +1,38 @@
+package cachex
+
+import "strings"
+
+// Namespace isolates keys between different cache use-cases. (e.g. "channel_affinity:v1").
+type Namespace string
+
+func (n Namespace) prefix() string {
+	ns := strings.TrimSpace(string(n))
+	ns = strings.TrimRight(ns, ":")
+	if ns == "" {
+		return ""
+	}
+	return ns + ":"
+}
+
+func (n Namespace) FullKey(key string) string {
+	key = strings.TrimSpace(key)
+	if key == "" {
+		return ""
+	}
+	p := n.prefix()
+	if p == "" {
+		return strings.TrimLeft(key, ":")
+	}
+	if strings.HasPrefix(key, p) {
+		return key
+	}
+	return p + strings.TrimLeft(key, ":")
+}
+
+func (n Namespace) MatchPattern() string {
+	p := n.prefix()
+	if p == "" {
+		return "*"
+	}
+	return p + "*"
+}