feat: add MFA/TOTP auth, PII encryption, agents/leads/inquiries modules, and comprehensive tests

- Add TOTP-based MFA with setup, verify, disable, backup codes, and challenge flow
- Add PII field encryption middleware with AES-256-GCM and deterministic search hashes
- Add agents, inquiries, and leads domain modules with entities, events, value objects
- Add web dashboard pages for inquiries and leads with detail dialogs
- Add 30+ component tests (valuation, charts, listings, search, providers, UI)
- Add Prisma migrations for encryption hash columns and MFA TOTP support
- Fix all ESLint errors (unused imports, duplicate imports, lint auto-fixes)
- Update dependencies and lock file
- Clean up obsolete exploration/QA docs, add audit documentation

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/web/components/providers/__tests__/auth-provider.spec.tsx

@@ -0,0 +1,45 @@
+import { render, screen } from '@testing-library/react';
+import { describe, expect, it, vi } from 'vitest';
+import { AuthProvider } from '../auth-provider';
+
+const mockInitialize = vi.fn();
+
+vi.mock('@/lib/auth-store', () => ({
+  useAuthStore: (selector: (state: { initialize: () => void }) => unknown) =>
+    selector({ initialize: mockInitialize }),
+}));
+
+describe('AuthProvider', () => {
+  beforeEach(() => {
+    mockInitialize.mockClear();
+  });
+
+  it('renders children', () => {
+    render(
+      <AuthProvider>
+        <div>Child content</div>
+      </AuthProvider>,
+    );
+    expect(screen.getByText('Child content')).toBeInTheDocument();
+  });
+
+  it('calls initialize on mount', () => {
+    render(
+      <AuthProvider>
+        <div>Test</div>
+      </AuthProvider>,
+    );
+    expect(mockInitialize).toHaveBeenCalled();
+  });
+
+  it('renders multiple children', () => {
+    render(
+      <AuthProvider>
+        <div>Child 1</div>
+        <div>Child 2</div>
+      </AuthProvider>,
+    );
+    expect(screen.getByText('Child 1')).toBeInTheDocument();
+    expect(screen.getByText('Child 2')).toBeInTheDocument();
+  });
+});