feat(contracts): TTL management for vault and adapters

[ZacLou]

Closes #553

Implements persistent storage TTL bumping for the vault and both adapters so positions and configuration cannot silently expire while the contracts are actively used.

Changes

• Vault: instance TTL is bumped at the start of deposit, withdraw, set_paused, ransfer_admin, �ccept_admin, set_adapter, �egin_migration, and migrate_adapter.
• Vault: position (Entry/Principal) TTL is bumped on deposit, withdraw, get_position, and the new permissionless �xtend_position_ttl keeper entry point.
• Blend adapter: instance TTL is bumped in deposit, withdraw, and �ccrue.
• DeFindex adapter: instance TTL is bumped in deposit, withdraw, and otal_assets (the read that drives vault pricing, since DeFindex has no separate �ccrue).
• Added TTL-aware tests for all three crates.

Notes

• The position TTL constants are intentionally longer-lived than the instance TTL (120 days vs 30 days), matching the issue draft.
• No enum discriminants or existing runtime behavior are changed; only TTL extension calls are added.

[vercel]

@web-flow is attempting to deploy a commit to the Collins' projects Team on Vercel.

A member of the Team first needs to authorize it.