remove us ci, use CN as default region

Author: siyu

src/constants/Config.ts

@@ -9,7 +9,7 @@ export const Server = {
     name: "flat-server",
     version: packages.version,
     env: config.server.env,
-    region: config.server.region,
+    region: config.server.region || "CN",
     regionCode: config.server.region_code || 0,
 };
 

src/utils/ParseConfig.ts

@@ -30,7 +30,7 @@ type Config = {
     server: {
         port: number;
         env: string;
-        region: string;
+        region: string | null;
         region_code: number | null;
     };
     redis: {