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.

Src/World Server/WorldServer.h

@@ -342,6 +342,7 @@ class CWorldServer : public CServerSocket
         bool NPCMessage( CMonster* thismon, const char msg[200], const char npc[50] );
         bool NPCWhisper( CPlayer* thisclient, CMonster* thismon, const char msg[200], const char npc[50] );
         bool NPCAnnounce( const char msg[200], const char npc[50] );
+        void PollAdminQueue( );
         UINT GetMaxPartyExp( UINT partylevel );
         bool DoSkillScript( CCharacter* character, CSkills* thisskill );