feat: Phase 3 - Partners API (5 endpoints + 2 helpers)
- GET /api/v1/partners/stats/ - total, active, pendingKyc, highRisk counts
- GET /api/v1/partners/ - paginated list with status/kyc/type/search filters
- GET /api/v1/partners/:id/ - full detail with events, kycDocuments, dealTerms, ledger
- PATCH /api/v1/partners/:id/status/ - suspend/activate partner
- POST /api/v1/partners/:id/kyc/review/ - approve/reject KYC with reason
Helpers: _serialize_partner(), _partner_kyc_docs()
Status/KYC/type mapping: backend snake_case to frontend capitalised values
Risk score derived from kyc_compliance_status (high_risk=80, approved=5, etc.)
All views IsAuthenticated, models imported inside methods
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