Add server control (start/stop/restart, live logs, broadcast, kick) to webadmin

Docker SDK drives login/char/worldserver containers via docker.sock (mounted
read-only into webadmin); live logs stream over SSE with nginx buffering
disabled so lines arrive in real time. Broadcast/kick go through a new
admin_queue DB table that the world server polls every ~2s in its existing
WorldProcess tick loop, avoiding a second IPC channel to the game server.

database sql files/admin_queue.sql

@@ -0,0 +1,14 @@
+--
+-- Queue table the webadmin panel writes to and the world server polls
+-- (in WorldProcess, MainProcess.cpp) to execute broadcast/kick actions
+-- without needing a direct socket between the two processes.
+--
+
+CREATE TABLE IF NOT EXISTS `admin_queue` (
+  `id` int(11) NOT NULL auto_increment,
+  `type` varchar(20) NOT NULL,
+  `payload` varchar(255) NOT NULL,
+  `created_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  `executed` tinyint(1) NOT NULL DEFAULT 0,
+  PRIMARY KEY (`id`)
+) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_general_ci;