feat: Add deployment infrastructure and documentation

Docker:
- Add production-ready Dockerfiles for all microservices
- Optimize for multi-stage builds and minimal image sizes

Kubernetes:
- Add namespace and service manifests
- Include MongoDB and Redis deployment configurations
- Configure API server and charging engine deployments

Documentation:
- Add comprehensive README with platform overview
- Include technology stack and quick start instructions
- Provide prerequisites and setup guidance

deployments/docker/api-server.Dockerfile

@@ -0,0 +1,22 @@
+FROM golang:1.26-alpine AS builder
+
+WORKDIR /app
+
+COPY apps/api-server/go.mod apps/api-server/go.sum ./
+RUN go mod download
+
+COPY apps/api-server/ ./
+
+RUN CGO_ENABLED=0 GOOS=linux go build -o api-server .
+
+FROM alpine:latest
+
+RUN apk --no-cache add ca-certificates
+
+WORKDIR /root/
+
+COPY --from=builder /app/api-server .
+
+EXPOSE 8000
+
+CMD ["./api-server"]