fix: remove duplicate bufferRules table and duplicate properties blocking Docker build

CI Run 942 Docker build fails on TS2451 (duplicate bufferRules at lines
190 & 653 of schema.ts), TS1117 (duplicate defaultBufferMinutes in
services table, duplicate coatType/petSizeCategory in factories.ts),
and TS2322 (null vs number for defaultBufferMinutes in factories.ts).

Keep the newer, more complete bufferRules declaration (with comments and
index) and the .notNull().default(0) variant of defaultBufferMinutes.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/db/src/factories.ts

@@ -105,8 +105,6 @@ export function buildPet(overrides: Partial<PetRow> & { clientId: string }): Pet
     photoKey: null,
     photoUploadedAt: null,
     image: null,
-    coatType: null,
-    petSizeCategory: null,
     createdAt: new Date("2025-01-01T00:00:00Z"),
     updatedAt: new Date("2025-01-01T00:00:00Z"),
   };
@@ -121,7 +119,7 @@ export function buildService(overrides: Partial<ServiceRow> = {}): ServiceRow {
     description: "A grooming service",
     basePriceCents: 6500,
     durationMinutes: 60,
-    defaultBufferMinutes: null,
+    defaultBufferMinutes: 0,
     active: true,
     createdAt: new Date("2025-01-01T00:00:00Z"),
     updatedAt: new Date("2025-01-01T00:00:00Z"),