Reimbursement: sync as QBO Bill

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Summary

Makes `Reimbursement` follow the same QBO Bill lifecycle as every other payable host (ContributorPayout, ContributorAdjustment, ProfitShare, Trueup, PayStub). Previously reimbursements never pushed to QBO and were settled by hand via a matching negative ContributorAdjustment booked off-platform — that made them invisible to the QBO vendor record.

Changes

• Migration adds `qbo_bill_id` (string) + index to `reimbursements`
• `Reimbursement` includes `SyncsAsQboBill` and implements the contract: `bill_txn_date`, `bill_description`, `bill_doc_number_code` (`"RB"`)
• Acceptance toggle in `app/admin/contributors.rb`:
  • Accept → `sync_qbo_bill!` (best-effort; logs Rails error on failure so the admin can retry)
  • Deny → `detach_and_destroy_qbo_bill` so the books stay aligned
• New rake task `reimbursements:backfill_qbo_bills` pushes existing accepted-but-unsynced rows. Idempotent; silently skips contributors lacking a `ContributorQboVendor` mapping.

QBO account routing

Uses the default "Contractors - Client Services" category (same as other hosts). If a different expense category is wanted later, override `Reimbursement#find_qbo_account!`.

Rollout

1. Merge + deploy
2. Run `bundle exec rake reimbursements:backfill_qbo_bills` once on production
3. Going forward, every Accept push automatically syncs the Bill

Test plan

• CI green
• Accept a new reimbursement on staging → confirm a QBO Bill is created against the contributor's vendor record
• Deny that reimbursement → confirm the QBO Bill is detached + destroyed
• Run the backfill rake on staging → confirm existing accepted rows get qbo_bill_id populated

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