feat: OpenSourceTools v2.1.0 - 升级 Bukkit 1.21.11, 补充 README 与自动化测试设施

tools/smoke-test/server.properties

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+#Minecraft server properties (smoke test)
+online-mode=false
+server-port=25570
+server-ip=
+level-name=world
+level-type=minecraft\:flat
+generate-structures=false
+spawn-monsters=false
+spawn-npcs=false
+spawn-animals=false
+view-distance=2
+simulation-distance=2
+max-players=10
+spawn-protection=0
+motd=OST-smoke-test
+enable-rcon=false
+network-compression-threshold=256