feat: optimize job registry bid handling with indexed storage and com…

[Benedict315]

Summary

Implements SC-REG-024 by optimizing Job Registry bid storage from a monolithic per-job bid vector into indexed bid records with bounded access.

Changes

• Replaced Bids(job_id) vector storage with:
  • BidCount(job_id)
  • Bid(job_id, index)
  • BidIndex(job_id, freelancer)
• Added compact CID validation naming for job metadata, proposals, and deliverables.
• Updated accept_bid so only the job creator can assign a submitted bidder.
• Transitioned accepted jobs to Assigned.
• Added get_bid_at for bounded indexed bid reads.
• Added specific BidIndexOutOfBounds error code for invalid bid indices.
• Preserved get_bids compatibility by reconstructing the bid list from indexed rows.
• Updated contract documentation and storage optimization notes.

Validation

• Added tests for:
  • Indexed bid row reads
  • Out-of-bounds bid index rejection
  • Oversized CID rejection
  • Late bid submission after assignment
• Ran git diff --check successfully.

Note: cargo test -p job_registry could not be run locally because cargo is not available in the current environment PATH.

closes #378

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[soomtochukwu]

If you could fix the merge conflict quick enough