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/login.spec.ts

@@ -0,0 +1,15 @@
+import { test, expect } from '@playwright/test';
+
+test.describe('登录流程', () => {
+  test('显示登录页面', async ({ page }) => {
+    await page.goto('/#/login');
+    await expect(page.locator('.ant-card, .ant-form')).toBeVisible();
+  });
+
+  test('空表单提交显示验证错误', async ({ page }) => {
+    await page.goto('/#/login');
+    await page.click('button[type="submit"]');
+    // Ant Design 应显示验证错误
+    await expect(page.locator('.ant-form-item-explain-error')).toHaveCount(2); // 用户名 + 密码
+  });
+});