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>

package.json

@@ -43,6 +43,7 @@
         "tailwindcss-react-aria-components": "^2.0.1"
     },
     "devDependencies": {
+        "@playwright/test": "^1.59.1",
         "@tailwindcss/postcss": "^4.1.18",
         "@trivago/prettier-plugin-sort-imports": "^5.2.2",
         "@types/jssip": "^3.5.3",