feat: theme mode support follows system

src/services/states.ts

@@ -1,6 +1,11 @@
 import { atom } from "recoil";
 import { ApiType } from "./types";
 
+export const atomThemeMode = atom<"light" | "dark">({
+  key: "atomThemeMode",
+  default: "light",
+});
+
 export const atomClashPort = atom<number>({
   key: "atomClashPort",
   default: 0,

src/services/types.ts

@@ -126,7 +126,7 @@ export namespace CmdType {
   export interface VergeConfig {
     language?: string;
     clash_core?: string;
-    theme_mode?: "light" | "dark";
+    theme_mode?: "light" | "dark" | "system";
     theme_blur?: boolean;
     traffic_graph?: boolean;
     enable_tun_mode?: boolean;