feat: initial frontend codebase — EnCoach v3

React 18 + TypeScript + Vite 5 + Tailwind CSS + shadcn/ui frontend:
- Multi-role auth: student, teacher, admin, corporate, agent, developer
- Student portal: dashboard, courses, adaptive learning, exams, placement
- Teacher portal: courses, assignments, grading, attendance, AI workbench
- Admin portal: 60+ management pages (LMS, exams, users, entities, AI)
- AI-powered features: study coach, generation page, gap analysis, TTS
- Exam system: session, auto-save, results, grading queue
- Full IELTS workflow: reading/listening/writing/speaking modules

Made-with: Cursor

Dockerfile

@@ -0,0 +1,41 @@
+FROM node:18-alpine AS build
+WORKDIR /app
+COPY package.json package-lock.json ./
+RUN npm ci
+COPY . .
+ARG VITE_API_BASE_URL=/api
+ARG VITE_APP_NAME=EnCoach
+ENV VITE_API_BASE_URL=$VITE_API_BASE_URL
+ENV VITE_APP_NAME=$VITE_APP_NAME
+RUN npm run build
+
+FROM nginx:stable-alpine
+COPY --from=build /app/dist /usr/share/nginx/html
+COPY <<'NGINX' /etc/nginx/conf.d/default.conf
+server {
+    listen 80;
+    server_name _;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    location /api/ {
+        proxy_pass         http://backend:8069/api/;
+        proxy_set_header   Host              $host;
+        proxy_set_header   X-Real-IP         $remote_addr;
+        proxy_set_header   X-Forwarded-For   $proxy_add_x_forwarded_for;
+        proxy_set_header   X-Forwarded-Proto $scheme;
+        proxy_read_timeout 300s;
+    }
+
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    location ~* \.(?:css|js|svg|png|jpg|jpeg|gif|ico|woff2?|ttf|eot)$ {
+        expires 30d;
+        add_header Cache-Control "public, immutable";
+    }
+}
+NGINX
+EXPOSE 80
+CMD ["nginx", "-g", "daemon off;"]