feat(07-unified-service-catalog): add services table to schema with audit trail columns

- New `services` pgTable with: id, name, description, unit_price, category, active, migrated_from, migrated_id, created_at
- Audit trail columns (migrated_from, migrated_id) enable rollback safety during expand-contract migration
- Service and NewService TypeScript types exported
- Migration SQL file created (0001_add_services_table.sql) for schema push
- No FK relations added yet (Phase 8 will establish connections)
- service_catalog, offer_services tables unchanged — legacy compatibility preserved
- npm run build passes TypeScript checks

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

src/db/schema.ts

@@ -172,6 +172,28 @@ export const service_catalog = pgTable("service_catalog", {
   active: boolean("active").notNull().default(true),
 });
 
+// ============ SERVICES (UNIFIED CATALOG — replaces service_catalog + offer_services) ============
+// migrated_from/migrated_id provide audit trail for safe rollback during the
+// expand-contract migration (Phase 7 expand; Phase 8 begins contract on offer side).
+export const services = pgTable("services", {
+  id: text("id")
+    .primaryKey()
+    .$defaultFn(() => nanoid()),
+  name: text("name").notNull(),
+  description: text("description"),
+  unit_price: numeric("unit_price", { precision: 10, scale: 2 }).notNull(),
+  category: text("category"),
+  active: boolean("active").notNull().default(true),
+  migrated_from: text("migrated_from"),   // "service_catalog" | "offer_services" | null (new rows after Phase 7)
+  migrated_id: text("migrated_id"),       // original id from source table, null for new rows
+  created_at: timestamp("created_at", { withTimezone: true }).notNull().defaultNow(),
+});
+
+export const servicesRelations = relations(services, (_) => ({
+  // No FK relations yet in Phase 7 — quote_items and offer_micro_services
+  // continue to reference service_catalog/offer_services until Phase 8.
+}));
+
 // ============ QUOTE ITEMS (admin-only — NEVER exposed via client API) ============
 export const quote_items = pgTable("quote_items", {
   id: text("id")
@@ -386,6 +408,8 @@ export type Document = typeof documents.$inferSelect;
 export type NewDocument = typeof documents.$inferInsert;
 export type Note = typeof notes.$inferSelect;
 export type NewNote = typeof notes.$inferInsert;
+export type Service = typeof services.$inferSelect;
+export type NewService = typeof services.$inferInsert;
 export type ServiceCatalog = typeof service_catalog.$inferSelect;
 export type NewServiceCatalog = typeof service_catalog.$inferInsert;
 export type QuoteItem = typeof quote_items.$inferSelect;