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/routes/pets.ts

@@ -1,8 +1,7 @@
 import { Hono } from "hono";
 import { zValidator } from "@hono/zod-validator";
 import { z } from "zod";
-import { eq } from "drizzle-orm";
-import { getDb, pets } from "@groombook/db";
+import { eq, getDb, pets } from "@groombook/db";
 
 export const petsRouter = new Hono();
 
@@ -42,8 +41,15 @@ petsRouter.get("/:id", async (c) => {
 
 petsRouter.post("/", zValidator("json", createPetSchema), async (c) => {
   const db = getDb();
-  const body = c.req.valid("json");
-  const [row] = await db.insert(pets).values(body).returning();
+  const { weightKg, dateOfBirth, ...rest } = c.req.valid("json");
+  const [row] = await db
+    .insert(pets)
+    .values({
+      ...rest,
+      weightKg: weightKg?.toString(),
+      dateOfBirth: dateOfBirth ? new Date(dateOfBirth) : undefined,
+    })
+    .returning();
   return c.json(row, 201);
 });
 
@@ -52,10 +58,15 @@ petsRouter.patch(
   zValidator("json", updatePetSchema),
   async (c) => {
     const db = getDb();
-    const body = c.req.valid("json");
+    const { weightKg, dateOfBirth, ...rest } = c.req.valid("json");
     const [row] = await db
       .update(pets)
-      .set({ ...body, updatedAt: new Date() })
+      .set({
+        ...rest,
+        weightKg: weightKg?.toString(),
+        dateOfBirth: dateOfBirth ? new Date(dateOfBirth) : undefined,
+        updatedAt: new Date(),
+      })
       .where(eq(pets.id, c.req.param("id")))
       .returning();
     if (!row) return c.json({ error: "Not found" }, 404);