bug: Map-to-map transition never triggered — advanceToNextMap() is never called

[TheMeinerLP]

Description

`GameOrchestrator.advanceToNextMap()` (or equivalent) exists but is never called after a map finishes. The cup therefore never progresses beyond the first map, and the end-of-cup flow (final scoreboard, winner announcement) is unreachable.

Acceptance Criteria

• After `GamePhase` ends, the system checks whether more maps remain in the current cup
• If maps remain: players are transitioned to the next map (teleport, HUD reset, ring state reset)
• If no maps remain: the cup ends and `EndPhase` is triggered
• Map index is tracked correctly in `CupComponent` across transitions
• Per-map scores are preserved and accumulated into the cup total

Technical Details

• Wire the call in the phase-transition callback after `GamePhase.onFinish()`
• A thin `MapTransitionPhase` (3-second countdown: "Next map: ...") improves player orientation
• `ActiveMapComponent` must be updated with the new map on each transition
• Unload the previous Minestom instance to free memory

Dependencies

• Phase wiring (issue: map never loads)
• Race end condition (GamePhase must be able to finish)

Estimate

M