Add custom outbound support (#9817)

* Add custom outbound support

* Add test

* Add inner fmt support

* Full config to outbounds

* Rename to `Outbound`

* AI optimized

* Fix

* Add bind interface placeholder

---------

Co-authored-by: 2dust <31833384+2dust@users.noreply.github.com>

v2rayN/ServiceLib/Models/CoreConfigs/CoreConfigContext.cs

@@ -11,6 +11,8 @@ public record CoreConfigContext
     public Config AppConfig { get; init; } = new();
     public FullConfigTemplateItem? FullConfigTemplate { get; init; } = new();
 
+    public Dictionary<string, string> CustomOutboundContent { get; init; } = new();
+
     // Test ServerTestItem Map
     public Dictionary<string, string> ServerTestItemMap { get; init; } = new();
 
@@ -22,4 +24,7 @@ public record CoreConfigContext
 
     public bool IsWindows { get; init; }
     public bool IsMacOS { get; init; }
+
+    // Generation Context
+    public Dictionary<object, string> CustomOutboundMap { get; init; } = new();
 }