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>

services/api-gateway/Dockerfile

@@ -0,0 +1,17 @@
+FROM python:3.11-slim
+
+WORKDIR /app
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    gcc \
+    libpq-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY app ./app
+
+EXPOSE 8000
+
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]