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>

nginx/nginx.conf

@@ -0,0 +1,50 @@
+events {
+    worker_connections 1024;
+}
+
+http {
+    include /etc/nginx/mime.types;
+    default_type application/octet-stream;
+
+    upstream api {
+        server api-gateway:8000;
+    }
+
+    upstream whatsapp {
+        server whatsapp-core:3001;
+    }
+
+    server {
+        listen 80;
+        server_name localhost;
+
+        location / {
+            root /usr/share/nginx/html;
+            index index.html;
+            try_files $uri $uri/ /index.html;
+        }
+
+        location /api {
+            proxy_pass http://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_read_timeout 300;
+        }
+
+        location /auth {
+            proxy_pass http://api;
+            proxy_set_header Host $host;
+            proxy_set_header X-Real-IP $remote_addr;
+        }
+
+        location /ws {
+            proxy_pass http://whatsapp;
+            proxy_http_version 1.1;
+            proxy_set_header Upgrade $http_upgrade;
+            proxy_set_header Connection "upgrade";
+            proxy_set_header Host $host;
+            proxy_read_timeout 86400;
+        }
+    }
+}