Send-test uses form auth values directly (no save required)

The "send test" button now passes the currently typed token / login /
password to /api/test, falling back to saved defaults. Previously the
test only used saved settings, so testing before clicking Save sent no
auth and failed with 403 on access-controlled ntfy servers.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/main.py

@@ -526,8 +526,11 @@ async def test_notification(
     server = data.server.strip() or s.default_ntfy_server
     if not data.topic.strip():
         raise HTTPException(400, "Укажите тему")
-    # Use a custom server's own auth only if it matches the default; otherwise
-    # fall back to the configured default-server credentials.
+    # Prefer auth typed in the form right now; fall back to saved defaults so
+    # the test works whether or not settings were saved first.
+    token = s.default_ntfy_token if data.token is None else data.token.strip()
+    username = s.default_ntfy_username if data.username is None else data.username.strip()
+    password = s.default_ntfy_password if data.password is None else data.password
     try:
         await ntfy.publish(
             server=server,
@@ -536,9 +539,9 @@ async def test_notification(
             message="Тестовое уведомление — всё работает!",
             tags="white_check_mark",
             priority=3,
-            token=s.default_ntfy_token,
-            username=s.default_ntfy_username,
-            password=s.default_ntfy_password,
+            token=token,
+            username=username,
+            password=password,
         )
     except Exception as exc:  # noqa: BLE001
         raise HTTPException(502, f"Не удалось отправить: {exc}")