chore: bulk commit of pre-existing changes

Includes:
- Admin dashboard layout and page updates
- API account auth module (routes, schemas, service)
- Dashboard sign-up form extraction, middleware refactor
- Marketplace proxy and middleware updates
- CORS origins expansion for dev environment
- Seed email domain correction (.com → .ma)
- Docs: create-account guide, fleet page, signup plan
- Various UI component and layout refinements

apps/api/src/tests/api/api-foundation.api.test.ts

@@ -75,6 +75,18 @@ describe('API foundation integration', () => {
     expect(res.body.paths).toHaveProperty('/health')
   })
 
+  it('allows dashboard credentialed preflights to employee auth routes', async () => {
+    const res = await request(app)
+      .options('/api/v1/auth/employee/menu')
+      .set('Origin', 'http://localhost:3001')
+      .set('Access-Control-Request-Method', 'GET')
+      .set('Access-Control-Request-Headers', 'content-type')
+
+    expect(res.status).toBe(204)
+    expect(res.headers['access-control-allow-origin']).toBe('http://localhost:3001')
+    expect(res.headers['access-control-allow-credentials']).toBe('true')
+  })
+
   it('blocks legacy anonymous access to customer identity document storage paths', async () => {
     const res = await request(app).get('/storage/companies/company_1/customers/customer_1/passport.jpg')