Load Turnstile site key at runtime

src/dataService.ts

@@ -55,8 +55,19 @@ const buildDateRangeParams = (dateRange: DateRange) => new URLSearchParams({
     end: formatDateParam(dateRange.end)
 });
 
+export type LoginConfig = {
+  captchaRequired: boolean;
+  turnstileSiteKey: string;
+};
+
 export type LoginResult = 'success' | 'invalid_credentials' | 'captcha_failed' | 'server_error';
 
+export const getLoginConfig = async (): Promise<LoginConfig> => {
+  const response = await fetch(`${API_URL}/login/config`, { cache: 'no-store' });
+  if (!response.ok) throw new Error('Failed to load login config');
+  return response.json() as Promise<LoginConfig>;
+};
+
 export const login = async (email: string, password: string, captchaToken?: string): Promise<LoginResult> => {
   try {
     const response = await fetch(`${API_URL}/login`, {