feat: appointment scheduling, client/pet/service/staff CRUD UI

* feat: appointment scheduling, client/pet/service/staff CRUD UI

- Weekly calendar view with navigation, color-coded by status
- Booking form with client→pet→service→staff→date/time flow
- Double-booking conflict detection on POST/PATCH appointments
- DELETE /api/appointments endpoint
- Staff API route (/api/staff) with full CRUD
- Clients page: searchable list, create/edit clients, add/edit pets
- Services page: table with create/edit/toggle-active
- Staff page: table with create/edit/toggle-active
- Nav bar with active-link highlighting, Staff link added

Resolves GitHub groombook/groombook#1, #2, #8

Co-Authored-By: Paperclip <noreply@paperclip.ing>

* fix: remove unused import, fix useCallback deps

- Remove unused `or` import from drizzle-orm in appointments route
- Compute week end directly in loadAppointments callback to avoid
  exhaustive-deps lint warning (weekEnd derived from weekStart)

Co-Authored-By: Paperclip <noreply@paperclip.ing>

* chore: add pnpm lockfile

Required for CI --frozen-lockfile installs.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

* fix: resolve all typecheck, lint, and test failures

- Add @types/node to packages/db devDependencies (typecheck was missing process)
- Re-export drizzle-orm helpers (eq, gte, etc.) from @groombook/db to avoid
  duplicate-instance type conflicts; remove drizzle-orm direct dep from API
- Add @hono/zod-validator and jose as direct API dependencies
- Merge duplicate @groombook/db imports in all route files
- Fix noUncheckedIndexedAccess errors: appointments PATCH, web calendar grid
- Fix weightKg/dateOfBirth type conversion in pets route (numeric→string, string→Date)
- Add eslint.config.js for API and web (ESLint 9 flat config format)
- Add vitest.config.ts with passWithNoTests for API and web

Co-Authored-By: Paperclip <noreply@paperclip.ing>

---------

Co-authored-by: Groom Book CTO <cto@groombook.app>
Co-authored-by: Paperclip <noreply@paperclip.ing>

apps/api/src/index.ts

@@ -6,6 +6,7 @@ import { clientsRouter } from "./routes/clients.js";
 import { petsRouter } from "./routes/pets.js";
 import { servicesRouter } from "./routes/services.js";
 import { appointmentsRouter } from "./routes/appointments.js";
+import { staffRouter } from "./routes/staff.js";
 import { authMiddleware } from "./middleware/auth.js";
 
 const app = new Hono();
@@ -31,6 +32,7 @@ api.route("/clients", clientsRouter);
 api.route("/pets", petsRouter);
 api.route("/services", servicesRouter);
 api.route("/appointments", appointmentsRouter);
+api.route("/staff", staffRouter);
 
 const port = Number(process.env.PORT ?? 3000);
 console.log(`API server listening on port ${port}`);