feat(GRO-106): portal Communication tab — real backend

- Added GET /portal/conversation and GET /portal/conversation/messages endpoints
- Created Communication.api.ts with typed fetchers and React hooks
- Rewired Communication.tsx to use real API, removed mock data
- Added composer-disabled bar with "Reply from your phone" tooltip
- Added conversation route tests to portal.test.ts

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

packages/db/src/factories.ts

@@ -103,6 +103,8 @@ export function buildPet(overrides: Partial<PetRow> & { clientId: string }): Pet
     photoKey: null,
     photoUploadedAt: null,
     image: null,
+    sizeCategory: null,
+    coatType: null,
     createdAt: new Date("2025-01-01T00:00:00Z"),
     updatedAt: new Date("2025-01-01T00:00:00Z"),
   };
@@ -117,6 +119,7 @@ export function buildService(overrides: Partial<ServiceRow> = {}): ServiceRow {
     description: "A grooming service",
     basePriceCents: 6500,
     durationMinutes: 60,
+    defaultBufferMinutes: 0,
     active: true,
     createdAt: new Date("2025-01-01T00:00:00Z"),
     updatedAt: new Date("2025-01-01T00:00:00Z"),
@@ -148,6 +151,7 @@ export function buildAppointment(
     confirmationStatus: "pending",
     confirmedAt: null,
     cancelledAt: null,
+    bufferMinutes: 0,
     confirmationToken: null,
     customerNotes: null,
     createdAt: new Date("2025-01-01T00:00:00Z"),