fix: resolve admin session infinite reload loop and sync auth state

- Prevent infinite redirection loop by clearing oidc-client user state on 401 errors.
- Sync apiClient request interceptor to use userManager.getUser() for reliable token retrieval.
- Add extensive console logs for better session issue diagnosis.
- Fix TS error in LoginPage by updating button variant.
- Revert 'ae03fe1' (updated playwright fixtures to real domain) as requested.

adminfront/tests/users_bulk.spec.ts

@@ -9,7 +9,7 @@ test.describe("Users Bulk Upload", () => {
         window as Window & typeof globalThis & { _IS_TEST_MODE?: boolean }
       )._IS_TEST_MODE = true;
 
-      const authority = "https://sso.hmac.kr/oidc";
+      const authority = "http://localhost:5000/oidc";
       const client_id = "adminfront";
       const key = `oidc.user:${authority}:${client_id}`;
       const authData = {
@@ -54,7 +54,7 @@ test.describe("Users Bulk Upload", () => {
     });
 
     await page.route("**/oidc/**", async (route) => {
-      await route.fulfill({ json: { issuer: "https://sso.hmac.kr/oidc" } });
+      await route.fulfill({ json: { issuer: "http://localhost:5000/oidc" } });
     });
   });