feat: add immutable condition proof API

[kryputh]

Fixes #12

Summary

• add an API for tenants to record baseline property condition during the first 24 hours after move-in
• hash uploaded photo content and note content for immutable condition evidence
• store proof records by lease_id and expose them for the Soroban arbitration hook

Changes

• added POST /leases/:leaseId/condition-proofs
• added GET /leases/:leaseId/condition-proofs
• added GET /leases/:leaseId/condition-proofs/arbitration-hook
• added a JSON-backed condition proof store
• added hashing and 24-hour window enforcement in the service layer
• added tests for successful proof creation, window rejection, and arbitration packet retrieval

Testing

• npm.cmd test -- --runInBand

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[kryputh]

fixed