Enable beta auto-deploy + Tianji beta ID / consent-gated events (#35) (#42)

## Summary

Closes #35.

- **Flip deploy workflows** (mirror `dta_webapp`): push/merge to `master` → auto-deploy **beta**; **Deploy Prod** is `workflow_dispatch` only
- **Tianji**: `REACT_APP_TIANJI_WEBSITE_ID` + `REACT_APP_DEPLOY_ENV` in `.env.production` / `.env.beta`; Tracker loads page views always on prod/beta
- **Consent policy**: page views always live; custom events / identify gated via `analyticsConsent` + `AnalyticsConsentBanner` + `trackEvent`/`identifyUser` helpers (call sites remain #36)
- Remove invalid Tianji `<script>` from `index.tsx` (Tracker component owns injection)
- README documents beta auto / prod button + Tianji policy

## Ops note — beta Tianji website ID

Prod ID unchanged: `cm7x7m52m03kbddswbswrt17y`.

`.env.beta` has `REACT_APP_TIANJI_WEBSITE_ID=` empty until a **Hesychia Beta** website is created in Tianji (workspace `cm7w8087y020lddswyhamadj2`). Paste the new id into `.env.beta` before beta page views show under a distinct site.

## Test plan

- [x] `npm run test:ci` (106 tests)
- [ ] Create Hesychia Beta Tianji website; set `REACT_APP_TIANJI_WEBSITE_ID` in `.env.beta`
- [ ] Merge to master → Deploy Beta runs; prod does **not** auto-deploy
- [ ] Manual Run workflow on Deploy Prod still works
- [ ] Beta build hits `beta.chatbackend` REST/WS; static root `/var/www/beta.chat.aimloperations/html` (8083)
- [ ] Prod/beta: tracker.js loads without accepting consent; banner shows until Accept/Decline; `trackEvent` only fires after AcceptReviewed-on: #42

llm-fe/src/App.tsx

@@ -19,6 +19,8 @@ import AnalyticsPage from './llm-fe/pages/Analytics/Analytics';
 import PasswordResetConfirmation from './llm-fe/pages/PasswordResetConfirmation/PasswordReset';
 import GlobalThemeWrapper from './llm-fe/components/GlobalThemeWrapper/GlobalThemeWrapper';
 import Tracker from './llm-fe/components/Tracker/Tracker';
+import { AnalyticsConsentProvider } from './llm-fe/contexts/AnalyticsConsentContext';
+import AnalyticsConsentBanner from './llm-fe/components/AnalyticsConsentBanner/AnalyticsConsentBanner';
 
 const ProtectedRoutes = () => {
   const { authenticated, loading } = useContext(AuthContext);
@@ -40,7 +42,9 @@ class App extends Component {
   render() {
     return (
       <GlobalThemeWrapper>
+        <AnalyticsConsentProvider>
         <Tracker />
+        <AnalyticsConsentBanner />
         <div className='site'>
           <main>
             <div className="main-container">
@@ -76,6 +80,7 @@ class App extends Component {
 
           </main>
         </div>
+        </AnalyticsConsentProvider>
       </GlobalThemeWrapper>