Initial commit: Add NaaS (No as a Service) implementation

Add complete NaaS HTTP service implementation with:
- Pure Rust implementation using only standard library
- Multiple response formats (text, JSON, XML, YAML, boolean)
- Embedded web frontend with mobile-responsive design
- Container support with Podman/Docker
- Systemd service configuration
- Health check endpoint
- CORS support

The service always responds with "no" in various formats,
optimized for minimal binary size (~1MB) and fast response times.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

naas.service

@@ -0,0 +1,50 @@
+[Unit]
+Description=No as a Service (NaaS)
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=simple
+Restart=always
+RestartSec=10
+TimeoutStopSec=30
+
+# User configuration (adjust as needed)
+User=naas
+Group=naas
+
+# Environment configuration
+Environment="PORT=8080"
+Environment="BUILDAH_FORMAT=docker"
+
+# Container management
+ExecStartPre=/usr/bin/podman rm -f naas-container 2>/dev/null || true
+ExecStartPre=/usr/bin/podman build -t naas:latest /opt/naas
+
+ExecStart=/usr/bin/podman run \
+  --name naas-container \
+  --rm \
+  --network=host \
+  --read-only \
+  --security-opt no-new-privileges \
+  --cap-drop ALL \
+  --cap-add NET_BIND_SERVICE \
+  -e PORT=8080 \
+  naas:latest
+
+ExecStop=/usr/bin/podman stop naas-container
+ExecStopPost=/usr/bin/podman rm -f naas-container 2>/dev/null || true
+
+# Security settings
+NoNewPrivileges=true
+PrivateTmp=true
+ProtectSystem=strict
+ProtectHome=true
+ReadWritePaths=
+
+# Resource limits
+MemoryLimit=256M
+CPUQuota=50%
+
+[Install]
+WantedBy=multi-user.target