Add the battle pass window (mt_battlepass)

战令 window opened by the 战令 button under the minimap or F6: season and
time left, missions with progress and per-mission claim, final reward,
done notices in chat. Talks to the server over /mt_bp 1 / MTBP1 lines and
reports an unsupported server after 3 s without an answer.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/platform/ScriptLib/PythonBoot.cpp

@@ -1010,6 +1010,7 @@ namespace PythonBoot
 #include "BossScript.inc"
 #include "VipScript.inc"
 #include "ModelPreviewScript.inc"
+#include "BattlePassScript.inc"
 
 static void install_script_module(const char* c_szModule, const char* c_szScript)
 {
@@ -1091,6 +1092,7 @@ bool RunMainScript(const char* lpCmdLine, std::string* error)
 		install_script_module("mt_boss", c_szBossScript);
 		install_script_module("mt_vip", c_szVipScript);
 		install_script_module("mt_preview", c_szModelPreviewScript);
+		install_script_module("mt_battlepass", c_szBattlePassScript);
 		if (g_touch_input)
 			install_script_module("mt_mobile_hud", c_szMobileHUDScript);
 	}