feat: 手动充值、邀请码注册与后台管理增强

新增玩家手动充值全流程（收款方式配置、充值下单/审核、钱包上分），
支持邀请码注册、邀请历史与专属返水率；完善后台代理/玩家管理与响应式操作栏，
并补充前台注册、充值页及多语言错误码。

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/api/prisma/migrations/20260611120000_user_invite_code/migration.sql

@@ -0,0 +1,11 @@
+-- AlterTable
+ALTER TABLE "users" ADD COLUMN "invite_code" VARCHAR(16);
+
+-- Backfill existing admins and agents with deterministic unique codes
+UPDATE "users"
+SET "invite_code" = UPPER(SUBSTR(MD5("id"::text || ':invite'), 1, 8))
+WHERE "user_type" IN ('ADMIN', 'AGENT')
+  AND "invite_code" IS NULL;
+
+-- CreateIndex
+CREATE UNIQUE INDEX "users_invite_code_key" ON "users"("invite_code");