feat(frontend): Implement HttpOnly cookie authentication and API v1 integration. Update AuthService for cookie-based session management, configure Axios with v1 prefix and credentials, and enhance OIDC callback logic.

frontend/src/components/auth/AuthCallback.tsx

@@ -7,9 +7,18 @@ export function AuthCallback() {
 
   useEffect(() => {
     const verifyAuth = async () => {
+      const urlParams = new URLSearchParams(window.location.search)
+      const code = urlParams.get("code")
+
       try {
-        // The cookie should have been set by the backend redirect
-        await AuthService.getMe()
+        if (code) {
+          // If we have a code, exchange it for a cookie
+          await AuthService.exchangeOIDCCode(code)
+        } else {
+          // If no code, just verify existing cookie (backend-driven redirect)
+          await AuthService.getMe()
+        }
+        
         // Success - go to home. We use window.location.href to ensure a clean reload of App state
         window.location.href = "/"
       } catch (err) {