feat: add E2E smoke tests, architecture docs, and operations runbook

- 27 Playwright E2E tests covering login (3 roles), CC Agent pages
  (call desk, call history, patients, appointments, my performance,
  sidebar, sign-out), and Supervisor pages (all 11 pages + sidebar)
- Tests run against live EC2 at ramaiah.engage.healix360.net
- Last test completes sign-out to release agent session for next run
- Architecture doc with updated Mermaid diagram including telephony
  dispatcher, service discovery, and multi-tenant topology
- Operations runbook with SSH access (VPS + EC2), accounts, container
  reference, deploy steps, Redis ops, and troubleshooting guide

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

e2e/helpers.ts

@@ -0,0 +1,15 @@
+import { Page, expect } from '@playwright/test';
+
+export async function waitForApp(page: Page) {
+    await page.waitForLoadState('networkidle', { timeout: 15_000 }).catch(() => {});
+    await page.waitForTimeout(300);
+}
+
+export async function loginAs(page: Page, email: string, password: string) {
+    await page.goto('/login');
+    await page.locator('input[type="email"], input[name="email"], input[placeholder*="@"]').first().fill(email);
+    await page.locator('input[type="password"]').first().fill(password);
+    await page.getByRole('button', { name: 'Sign in', exact: true }).click();
+    await expect(page).not.toHaveURL(/\/login/, { timeout: 20_000 });
+    await waitForApp(page);
+}