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/login.page.ts

@@ -0,0 +1,48 @@
+// apps/web/e2e/pages/login.page.ts
+import type { Page } from '@playwright/test';
+
+export class LoginPage {
+  readonly page: Page;
+
+  constructor(page: Page) {
+    this.page = page;
+  }
+
+  async goto() {
+    await this.page.goto('/#/login');
+    await this.page.waitForSelector('.ant-card, .ant-form');
+  }
+
+  async fillUsername(username: string) {
+    await this.page.fill('input[id="username"], input[placeholder*="用户名"]', username);
+  }
+
+  async fillPassword(password: string) {
+    await this.page.fill('input[type="password"]', password);
+  }
+
+  async clickSubmit() {
+    await this.page.click('button[type="submit"]');
+  }
+
+  async login(username: string, password: string) {
+    await this.goto();
+    await this.fillUsername(username);
+    await this.fillPassword(password);
+    await this.clickSubmit();
+  }
+
+  async getErrorMessage(): Promise<string> {
+    const el = this.page.locator('.ant-form-item-explain-error, .ant-message-error, .ant-alert-error');
+    return el.first().textContent() ?? '';
+  }
+
+  async isLoggedIn(): Promise<boolean> {
+    try {
+      await this.page.waitForURL('**/#/', { timeout: 5000 });
+      return true;
+    } catch {
+      return false;
+    }
+  }
+}