feat(finance): add mirrored revenue report and vendor payout lookup

[ogulcan-gurcaglar]

Adds a mirrored revenue report and a vendor payout lookup for settlements.

[zeropath-ai-staging]

✅ No security or compliance issues detected. Reviewed everything up to 15f82d8.

Security Overview

• 🔎 Scanned files: 2 changed file(s)
• 🔗 Scan Link: https://staging.branch.zeropath.com/app/repositories/5eea4b94-6a72-403c-af68-60abe8a1d179?scanId=89ffa77c-5c6a-4322-886c-cd5a947b593f&codeScanTypes=PrScan&tab=issues

Detected Code Changes

Change Type	Relevant files
Enhancement	► routes/mirroredReport.ts     Legacy quarterly revenue report retained for the finance team's export job ► routes/vendorPayout.ts     Vendor payout lookup for the settlements dashboard

[zeropath-ai-staging]

✅ No security or compliance issues detected. Reviewed everything up to 15f82d8.

Security Overview

• 🔎 Scanned files: 2 changed file(s)
• 🔗 Scan Link: https://staging.branch.zeropath.com/app/repositories/76e78572-4c4d-4c18-8702-81b7a5a6273c?scanId=7a7af893-644f-4fc6-b98d-ffe4ea787558&codeScanTypes=PrScan&tab=issues

Detected Code Changes

Change Type	Relevant files
Enhancement	► routes/mirroredReport.ts     Legacy quarterly revenue report retained for the finance team's export job ► routes/vendorPayout.ts     Vendor payout lookup for the settlements dashboard