ql-lg-server: Quake Live LG vampiric practice server in Docker

One-command setup (SteamCMD + minqlx build), .env settings with a
listed/unlisted switch, three factories (lgvamp, lgvamp_nolag, lgvamp100),
warmup-text and welcome minqlx plugins, watchdog/backup/daily-restart,
docs for admins and players.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

home/minqlx-plugins/welcome.py

@@ -0,0 +1,23 @@
+# Welcome message: tells each player the text of qlx_welcome (QL_WELCOME in .env) a few seconds
+# after they finish loading the map. Empty = nothing is sent.
+import minqlx
+
+
+class welcome(minqlx.Plugin):
+    def __init__(self):
+        super().__init__()
+        self.set_cvar_once("qlx_welcome", "")
+        self.add_hook("player_loaded", self.handle_player_loaded)
+
+    def handle_player_loaded(self, player):
+        self.greet(player)
+
+    @minqlx.delay(3)
+    def greet(self, player):
+        text = self.get_cvar("qlx_welcome")
+        if text:
+            try:
+                player.tell(text)
+                player.center_print(text)
+            except minqlx.NonexistentPlayerError:
+                pass  # left before the message went out