add financing/factoring interest checkbox on success page + campaign topics 16-17

- Checkbox on post-order success page: 'Interested in freight factoring?'
- Stores lead via /api/v1/insurance-leads with source=financing_interest
- Added factoring + fuel card campaign topics to docs

docs/campaign-topics-trucking.md

@@ -132,6 +132,26 @@ Each topic maps to a service we sell.
 
 ---
 
+## 💰 FINANCIAL SERVICES (Referral/Affiliate)
+
+### 16. "Stop Waiting 30-90 Days to Get Paid"
+- Freight factoring: get paid same-day on invoices (2-5% fee)
+- Cash advances for fuel, insurance, repairs
+- Fuel cards with discounts (Comdata, EFS, etc.)
+- Top vendors to partner with: TAFS, Apex Capital, RTS Financial, OTR Solutions, Triumph Pay
+- Revenue model: $100-500 referral fee per carrier, ongoing commission on volume
+- **CTA:** Check the "interested in factoring" box on order success page
+- **Sells:** Referral commissions, carrier retention (sticky relationship)
+
+### 17. "Fuel Cards That Save You $0.20+/Gallon"
+- Bundled with factoring or standalone
+- Major networks: Comdata, EFS, TCS, WEX
+- Discounts at TA/Petro, Pilot/Flying J, Love's
+- **CTA:** Request info on our fuel card program
+- **Sells:** Fuel card referral commissions
+
+---
+
 ## 📊 CAMPAIGN PRIORITY (by audience size)
 
 | Priority | Topic | Audience Size | Expected Conv |