feat: Foundation — auth system, 9 migrations, React frontend

Backend:
- Express server with JWT httpOnly cookie auth
- POST /api/auth/register, /api/auth/login, /api/auth/logout, GET /api/auth/me
- bcrypt 12 rounds, generic 401 errors (no email/password field disclosure)
- Auth middleware protects all /api/* routes except register/login
- pg Pool database connection

Frontend (React + Vite + TailwindCSS + shadcn/ui):
- AuthContext with session restore on page load via /api/auth/me
- ProtectedRoute redirects unauthenticated users to /login
- LoginPage, RegisterPage — Hebrew RTL layout (dir=rtl), inline validation
- DashboardPage placeholder
- shadcn/ui components: Button, Input, Label, Card

Database:
- 9 migrations (001-009): extensions, users, events, vendors, guests,
  bookings, invitations, vendor_ratings, organizer_preferences
- pg_trgm for fuzzy Hebrew search, GIN indexes on style_tags
- Phase 2+3 fields included: source, payment_status, contract_value,
  vendor ratings 6-dimension, organizer preferences
- Idempotent migration runner with schema_migrations tracking table

Infrastructure:
- Dockerfile (multi-stage: build React → production node:20-alpine)
- docker-compose.yml with PostgreSQL healthcheck, expose not ports
- Migrations run automatically on container start

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

client/src/pages/DashboardPage.tsx

@@ -0,0 +1,38 @@
+import { useAuth } from '@/contexts/AuthContext';
+import { Button } from '@/components/ui/button';
+import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
+
+export function DashboardPage() {
+  const { user, logout } = useAuth();
+
+  async function handleLogout() {
+    await logout();
+  }
+
+  return (
+    <div className="min-h-screen bg-muted/40 p-6" dir="rtl">
+      <div className="max-w-4xl mx-auto space-y-6">
+        <div className="flex items-center justify-between">
+          <h1 className="text-3xl font-bold">אירועית</h1>
+          <Button variant="outline" onClick={handleLogout}>
+            התנתקות
+          </Button>
+        </div>
+
+        <Card>
+          <CardHeader>
+            <CardTitle>ברוך הבא, {user?.display_name}</CardTitle>
+          </CardHeader>
+          <CardContent>
+            <p className="text-muted-foreground">
+              {user?.role === 'organizer' ? 'מארגן אירועים' : 'ספק שירותים'} • {user?.email}
+            </p>
+            <p className="mt-4 text-sm text-muted-foreground">
+              הלוח הראשי של {user?.role === 'organizer' ? 'האירועים' : 'הפרופיל'} שלך יוצג כאן בקרוב.
+            </p>
+          </CardContent>
+        </Card>
+      </div>
+    </div>
+  );
+}