feat: add Layer 1 foundation - Docker, WhatsApp Core, API Gateway, Frontend setup

- docker-compose.yml with PostgreSQL, Redis, all services
- nginx/nginx.conf reverse proxy configuration
- services/whatsapp-core: package.json, tsconfig.json, Dockerfile
- services/api-gateway: requirements.txt, Dockerfile, app/__init__.py
- frontend: package.json, tsconfig.json, vite.config.ts, index.html, Dockerfile, nginx.conf

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/nginx.conf

@@ -0,0 +1,28 @@
+server {
+    listen 80;
+    server_name localhost;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    location /api {
+        proxy_pass http://api-gateway:8000;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+    }
+
+    location /auth {
+        proxy_pass http://api-gateway:8000;
+        proxy_set_header Host $host;
+    }
+
+    location /ws {
+        proxy_pass http://whatsapp-core:3001;
+        proxy_http_version 1.1;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection "upgrade";
+    }
+}