MG-U: Cryptex Scroll-Wheel Password minigame for BreakEscape

[alihussain6692]

Implements MG-U — Cryptex / Scroll-Wheel Password Entry for BreakEscape.

Changes:

• New CryptexMinigame class with horizontal scroll-wheel rings
• Each ring cycles through configurable alphabet (up/down arrows)
• String answer format ("CYBER") auto-converts to wheel indices
• Wheels stay in place after wrong attempt (player sees their try)
• Optional hint strip with '_' for hidden characters
• Optional worn-ring visual (faded characters, scenario-configurable opacity)
• Server-side validation, max 3 attempts
• New lockType: "cryptex" in unlock-system.js

Example scenario usage:
{
"type": "safe",
"locked": true,
"lockType": "cryptex",
"cryptexConfig": {
"answer": "CYBER",
"alphabets": ["ABCDEFGHIJKLMNOPQRSTUVWXYZ"],
"hintStrip": ["C", "", "", "_", "R"],
"wornRings": { "positions": [1, 3], "wornOpacity": 0.25 }
}
}

Missions: M2, M3, M6, M9