feat: add ali wan video (#2141)

* feat: add ali wan video

* refactor: use same UnmarshalBodyReusable

* feat: enhance request body metadata

* feat: opt wan convertToOpenAIVideo

* feat: add wan support other param via json metadata

* refactor: remove unused code

* fix ali

---------

Co-authored-by: feitianbubu <feitianbubu@qq.com>

relay/channel/task/ali/constants.go

@@ -0,0 +1,11 @@
+package ali
+
+var ModelList = []string{
+	"wan2.5-i2v-preview", // 万相2.5 preview（有声视频）推荐
+	"wan2.2-i2v-flash",   // 万相2.2极速版（无声视频）
+	"wan2.2-i2v-plus",    // 万相2.2专业版（无声视频）
+	"wanx2.1-i2v-plus",   // 万相2.1专业版（无声视频）
+	"wanx2.1-i2v-turbo",  // 万相2.1极速版（无声视频）
+}
+
+var ChannelName = "ali"