Overworld Vanilla Structures

Overworld Vanilla Structures 1.0.6

• Fixed force-generation edge case where stale structures.yml entries could make TP report success without placing structure.
• /ovstructures tp now regenerates structure even on already-marked chunks to recover broken/legacy locations.
• Keeps 1.0.4/1.0.5 fixes: cleaner chunk-edge terrain shaping, cabin/interior fixes, loot reliability, and vanilla locate fallback.