Implement reputation recovery

[Maximum-Prosper]

Closes #460

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Title: Implement reputation recovery after inactivity

Description:
This PR adds score recovery to the reputation contract so inactive profiles gradually move back toward the default score after a defined cooldown period.

What changed:

Added last_activity tracking on profiles through the main reputation update paths.
Added a new recover_score contract API for authorized contracts.
Implemented safe recovery math that nudges scores toward the default 5_000 BPS value.
Added a ScoreRecovered event for visibility into recovery actions.
Updated profile mutation paths to refresh activity timestamps consistently.
Added unit tests covering recovery after inactivity and authorization checks.
Behavior:

Recovery only applies after 30 days of inactivity.
If the profile is still active, recovery returns the current score unchanged.
Blacklisted profiles cannot recover.
Recovery is only callable by an authorized contract.
Testing:

Added tests for recovery timing and authorization.
I could not run the Rust test suite here because cargo is not available in this environment.

[vercel]

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[soomtochukwu]

• see that the CI checks pass
• If you could fix the merge conflict(s) ASAP

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