feat(08-01): add offer_phases, offer_phase_services, and quotes table schema

- Create offer_phases table (hierarchical phases within offer micros)
- Create offer_phase_services junction (phases → unified services)
- Create quotes table (separate headers from line items)
- Create leads placeholder table (FK for quotes, Phase 10 CRM)
- Update quote_items: add quote_id, offer_micro_id, offer_phase_id columns
- Update projects: add offer_id, created_from_lead_id columns
- Update phases: add offer_phase_id column for audit trail
- Add all Drizzle relations and TypeScript types
- Build verified with npm run build

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

src/types/offer.ts

@@ -0,0 +1,11 @@
+// Export offer-related types from schema for use in components and API routes
+export type {
+  OfferPhase,
+  NewOfferPhase,
+  OfferPhaseService,
+  NewOfferPhaseService,
+  Quote,
+  NewQuote,
+  Lead,
+  NewLead,
+} from "@/db/schema";