feat: Merge Providers (#508)

src-tauri/src/utils/tmpl.rs

@@ -16,14 +16,22 @@ pub const ITEM_MERGE: &str = "# Merge Template for clash verge
 
 prepend-rules:
 
+prepend-rule-providers:
+
 prepend-proxies:
 
+prepend-proxy-providers:
+
 prepend-proxy-groups:
 
 append-rules:
 
+append-rule-providers:
+
 append-proxies:
 
+append-proxy-providers:
+
 append-proxy-groups:
 ";