Initialize Clash Web source and deployment documentation

deploy/clashweb.service

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+[Unit]
+Description=Clash Web management
+After=network-online.target clashweb-mihomo.service
+Wants=network-online.target
+
+[Service]
+Type=simple
+User=clashweb
+Group=clashweb
+SupplementaryGroups=clashweb-core
+EnvironmentFile=/etc/clashweb/env
+ExecStart=/usr/local/bin/clashweb
+Restart=on-failure
+RestartSec=3
+UMask=0027
+ProtectSystem=strict
+ProtectHome=true
+PrivateTmp=true
+ReadWritePaths=/var/lib/clashweb /var/lib/clashweb-core
+RestrictAddressFamilies=AF_INET AF_INET6 AF_UNIX AF_NETLINK
+
+[Install]
+WantedBy=multi-user.target