feat: initialize ERP base platform (extracted from HMS)

- Stripped 11 business crates (health, ai, dialysis, plugins)
- Cleaned AppState, AppConfig, main.rs from business coupling
- Reduced migrations from 169 to 53 (base-only)
- Removed health_provider trait from erp-core
- Removed business integration tests
- Removed gateway rate limiting middleware
- Base capabilities: auth, RBAC, JWT, config, workflow, message, plugin, audit, crypto, RLS, multi-tenant

Cargo check: OK
Cargo test: OK

apps/web/e2e/pages/index.ts

@@ -0,0 +1,6 @@
+// apps/web/e2e/pages/index.ts
+export { LoginPage } from './login.page';
+export { PatientListPage } from './patient-list.page';
+export { PatientDetailPage } from './patient-detail.page';
+export { HealthDataPage } from './health-data.page';
+export { AppointmentPage } from './appointment.page';