Add backend/frontend scaffolding with Oracle ADB wallet config

- Backend: Spring Boot 3 + WebFlux, JWT auth, Oracle ADB wallet,
  8 controllers/services/repositories (Auth~Tag), DTOs, exception handling
- Frontend: Next.js 15, TypeScript, Tailwind CSS, AuthContext,
  7 pages (dashboard, knowledge, chat, study, todos, habits, login)
- DB: V1 migration with 12 tables including VECTOR(1024) + HNSW index
- Ops: PM2 ecosystem config, deploy.sh, start-backend.sh
- CLAUDE.md: DB credentials replaced with env var references

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

sundol-frontend/src/app/login/page.tsx

@@ -0,0 +1,50 @@
+"use client";
+
+import { useState } from "react";
+import { useRouter } from "next/navigation";
+import { useAuth } from "@/lib/auth-context";
+
+export default function LoginPage() {
+  const router = useRouter();
+  const { login } = useAuth();
+  const [isLoading, setIsLoading] = useState(false);
+
+  const handleGoogleLogin = async () => {
+    setIsLoading(true);
+    try {
+      // TODO: Implement Google OAuth flow
+      // For now, placeholder
+      alert("Google OAuth not configured yet");
+    } catch (error) {
+      console.error("Login failed:", error);
+    } finally {
+      setIsLoading(false);
+    }
+  };
+
+  return (
+    <div className="flex items-center justify-center min-h-screen">
+      <div className="bg-[var(--color-bg-card)] rounded-2xl p-8 w-full max-w-md shadow-xl border border-[var(--color-border)]">
+        <div className="text-center mb-8">
+          <h1 className="text-3xl font-bold mb-2">SUNDOL</h1>
+          <p className="text-[var(--color-text-muted)]">
+            Smart Unified Natural Dog-Operated Layer
+          </p>
+        </div>
+        <button
+          onClick={handleGoogleLogin}
+          disabled={isLoading}
+          className="w-full py-3 px-4 bg-white text-gray-800 rounded-lg font-medium hover:bg-gray-100 transition-colors disabled:opacity-50 flex items-center justify-center gap-3"
+        >
+          <svg className="w-5 h-5" viewBox="0 0 24 24">
+            <path fill="#4285F4" d="M22.56 12.25c0-.78-.07-1.53-.2-2.25H12v4.26h5.92a5.06 5.06 0 0 1-2.2 3.32v2.77h3.57c2.08-1.92 3.28-4.74 3.28-8.1z"/>
+            <path fill="#34A853" d="M12 23c2.97 0 5.46-.98 7.28-2.66l-3.57-2.77c-.98.66-2.23 1.06-3.71 1.06-2.86 0-5.29-1.93-6.16-4.53H2.18v2.84C3.99 20.53 7.7 23 12 23z"/>
+            <path fill="#FBBC05" d="M5.84 14.09c-.22-.66-.35-1.36-.35-2.09s.13-1.43.35-2.09V7.07H2.18C1.43 8.55 1 10.22 1 12s.43 3.45 1.18 4.93l2.85-2.22.81-.62z"/>
+            <path fill="#EA4335" d="M12 5.38c1.62 0 3.06.56 4.21 1.64l3.15-3.15C17.45 2.09 14.97 1 12 1 7.7 1 3.99 3.47 2.18 7.07l3.66 2.84c.87-2.6 3.3-4.53 6.16-4.53z"/>
+          </svg>
+          {isLoading ? "Signing in..." : "Sign in with Google"}
+        </button>
+      </div>
+    </div>
+  );
+}