feat(ncm): unikey 失败自动 5s 退避重试（不再要求用户点重试）

patch_v2/ncm_app/app/ui/login.c

@@ -96,7 +96,14 @@ static void *login_worker(void *arg)
 {
     (void)arg;
     char unikey[64];
-    if (get_unikey_and_qr(unikey, sizeof unikey) != NCM_OK) { g_err = 1; return NULL; }
+    /* 自动重试：unikey 失败（网络未就绪/抖动）时 5s 退避重试，不再要求用户点重试 */
+    int retry = 0;
+    while (get_unikey_and_qr(unikey, sizeof unikey) != NCM_OK) {
+        g_err = 1;
+        if (g_app_quit) return NULL;
+        meow_log(MEOW_LOG_WARN, "login: unikey retry in 5s (attempt %d)", ++retry);
+        usleep(5 * 1000 * 1000);
+    }
     meow_log(MEOW_LOG_INFO, "login: poll worker start");
 
     char cookie[NCM_COOKIE_MAX];