refactor(frontend): replace React Router BFF with Wouter SPA

Remove React Router 7 SSR/BFF architecture (server-side loaders,
actions, sessions, remix-auth) and replace with a client-side SPA
using Wouter for routing and cookie-based JWT auth.

- Replace reactRouter() Vite plugin with @vitejs/plugin-react
- Add index.html + app/main.tsx as SPA entry points
- Add Wouter routing with auth guards (ProtectedRoute/PublicOnlyRoute)
- Add client-side auth (app/auth.ts) and useAuth hook
- Migrate all route files to app/pages/ with client-side data fetching
- Update NavigateLink and GolfPlayAppGaming to use Wouter Link
- Remove .server/, routes/, root.tsx, react-router.config.ts
- Clean up tsconfig.json (remove .react-router references)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

1 files changed, 101 insertions, 0 deletions

diff --git a/frontend/app/pages/LoginPage.tsx b/frontend/app/pages/LoginPage.tsx
new file mode 100644
index 0000000..c10b819
--- /dev/null
+++ b/frontend/app/pages/LoginPage.tsx
@@ -0,0 +1,101 @@
+import { type FormEvent, useState } from "react";
+import { useLocation } from "wouter";
+import BorderedContainer from "../components/BorderedContainer";
+import InputText from "../components/InputText";
+import SubmitButton from "../components/SubmitButton";
+import { APP_NAME } from "../config";
+import { useAuth } from "../hooks/useAuth";
+import { usePageTitle } from "../hooks/usePageTitle";
+
+export default function LoginPage() {
+	usePageTitle(`Login | ${APP_NAME}`);
+
+	const { login } = useAuth();
+	const [, navigate] = useLocation();
+
+	const [error, setError] = useState<string | null>(null);
+	const [fieldErrors, setFieldErrors] = useState<{
+		username?: string;
+		password?: string;
+	}>({});
+	const [submitting, setSubmitting] = useState(false);
+
+	async function handleSubmit(e: FormEvent<HTMLFormElement>) {
+		e.preventDefault();
+		const formData = new FormData(e.currentTarget);
+		const username = String(formData.get("username"));
+		const password = String(formData.get("password"));
+
+		const errors: { username?: string; password?: string } = {};
+		if (username === "") errors.username = "ユーザー名を入力してください";
+		if (password === "") errors.password = "パスワードを入力してください";
+		if (Object.keys(errors).length > 0) {
+			setFieldErrors(errors);
+			setError("ユーザー名またはパスワードが誤っています");
+			return;
+		}
+
+		setSubmitting(true);
+		setError(null);
+		setFieldErrors({});
+
+		try {
+			await login(username, password);
+			navigate("/dashboard");
+		} catch (err) {
+			setError(err instanceof Error ? err.message : "ログインに失敗しました");
+		} finally {
+			setSubmitting(false);
+		}
+	}
+
+	return (
+		<div className="min-h-screen bg-gray-100 flex items-center justify-center">
+			<div className="mx-2">
+				<BorderedContainer>
+					<form onSubmit={handleSubmit} className="w-full max-w-sm p-2">
+						<h2 className="text-2xl mb-6 text-center">
+							fortee アカウントでログイン
+						</h2>
+						{error && <p className="text-sky-500 text-sm mb-4">{error}</p>}
+						<div className="mb-4 flex flex-col gap-1">
+							<label
+								htmlFor="username"
+								className="block text-sm font-medium text-gray-700"
+							>
+								ユーザー名
+							</label>
+							<InputText type="text" name="username" id="username" required />
+							{fieldErrors.username && (
+								<p className="text-red-500 text-sm">{fieldErrors.username}</p>
+							)}
+						</div>
+						<div className="mb-6 flex flex-col gap-1">
+							<label
+								htmlFor="password"
+								className="block text-sm font-medium text-gray-700"
+							>
+								パスワード
+							</label>
+							<InputText
+								type="password"
+								name="password"
+								id="password"
+								autoComplete="current-password"
+								required
+							/>
+							{fieldErrors.password && (
+								<p className="text-red-500 text-sm">{fieldErrors.password}</p>
+							)}
+						</div>
+						<div className="flex justify-center">
+							<SubmitButton type="submit" disabled={submitting}>
+								{submitting ? "ログイン中..." : "ログイン"}
+							</SubmitButton>
+						</div>
+					</form>
+				</BorderedContainer>
+			</div>
+		</div>
+	);
+}