Bank Vault

Dead-asset removal. Product-wide -- all 32 cells rebuilt. No rendering change: everything removed here was already unreachable.

Removed

• textures/block/corner_front.png and textures/block/edge_front.png are gone. Both were referenced by nothing and shipped in every jar. The eight bank_vault_corner{0,90,180,270} and bank_vault_edge{0,90,180,270} models that were supposed to use them were bare {"parent": "bankvault:block/bank_vault_plain"} aliases, so the blockstate's 40 variants had only ever resolved to two real models. Those eight alias files are removed too and the blockstate now points at bank_vault_plain directly -- 40 variants, 2 models, identical rendering.
• Both orphan textures carried the SAME stray cross mark near their bottom-right corner that 1.4.11 removed from vault_metal.png (peaks 172 and 163 against a ~75 background), so the defect was set-wide rather than a one-off. Deleting them settles it without needing a second repair.