Initial commit: WebMail Gateway with PKCE support

- Multi-tenant routing support
- Keycloak SSO integration with PKCE
- Basic inbox functionality
- Redis session management

Dockerfile

@@ -0,0 +1,10 @@
+FROM python:3.11-slim
+
+WORKDIR /app
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY app.py .
+
+CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "8000"]