fix(launcher): restore maplestory launch guards

[lshw54]

What

MapleStory launch parity was missing three legacy behaviors from the WPF client:

• skip the Nexon Launcher Play dialog
• keep traditional login launching directly without forcing the OTP command-line branch
• block MapleStory auto-update by killing the matching Patcher.exe

Fix

Expose backend commands for the existing Play-window and Patcher guard primitives:

• closeMaplePlayWindow()
• checkAndKillMaplePatcher(gamePath)

After a successful MapleStory launch, the frontend now starts Maple-only guard polling for 610074_T9 / 610075_T9. The polling follows the existing Config.xml preferences:

• skipPlayWnd controls closing StartUpDlgClass / MapleStory
• autoKillPatcher controls killing Patcher.exe from the selected game directory

Adds regression coverage for:

• Maple guard polling behavior
• preference-gated Play/Patcher guards
• non-Maple games not starting Maple guards
• traditional login with login_action_type=1 launching directly with empty credentials

Closes #283