feat: Partner Command Center Module
- Extend types/partner.ts: riskScore, KYCDocument, PartnerEvent, RiskLevel
- Extend mockPartnerData.ts: risk scores, 15 KYC docs, 9 partner events, 6th partner
- Create lib/actions/partner-governance.ts: KYC verification, event approval, impersonation, 2FA/password reset, suspend/unsuspend
- Rewrite PartnerDirectory.tsx: card grid → data table with stats, risk gauge, filter tabs
- Rewrite PartnerProfile.tsx: tabs → 3-column layout (Identity | KYC Vault | Event Governance)
- Create KYCVaultPanel.tsx: per-doc approve/reject with progress bar and auto-verification
- Create EventApprovalQueue.tsx: pending events list with review dialog
- Create ImpersonationDialog.tsx: audit-aware confirmation with token generation
- Extend prisma/schema.prisma: PartnerProfile, PartnerDoc models, KYC/Event enums
- Add partner governance permission scopes to staff.ts
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