feat: initialize monorepo structure with Bun and Turborepo

- Add package.json for the root with workspace configuration and scripts
- Create @gruperly/config package with TypeScript configuration
- Establish shared package @gruperly/shared with Zod schemas for validation
- Implement group, student, and payment schemas using Zod
- Set up TypeScript configuration for shared package
- Document stack architecture and technical specifications in stack.md
- Configure Turborepo with build, dev, lint, and typecheck tasks

apps/api/src/db/client.ts

@@ -0,0 +1,3 @@
+import { PrismaClient } from '@prisma/client'
+
+export const prisma = new PrismaClient()

apps/api/src/db/index.ts

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+import { prisma } from './client'
+
+export { prisma }

apps/api/src/index.ts

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+import { Hono } from 'hono'
+import { cors } from 'hono/cors'
+import { authRoutes } from './routes/auth'
+import { groupsRoutes } from './routes/groups'
+import { studentsRoutes } from './routes/students'
+import { paymentsRoutes } from './routes/payments'
+import { waitlistRoutes } from './routes/waitlist'
+
+const app = new Hono()
+
+app.use('*', cors())
+
+app.get('/', (c) => c.json({ name: 'Gruperly API', status: 'ok' }))
+
+app.route('/auth', authRoutes)
+app.route('/groups', groupsRoutes)
+app.route('/students', studentsRoutes)
+app.route('/payments', paymentsRoutes)
+app.route('/waitlist', waitlistRoutes)
+
+export default app
+
+const port = Number(Bun.env.PORT ?? 4000)
+
+Bun.serve({
+  port,
+  fetch: app.fetch,
+})
+
+console.log(`Gruperly API running on http://localhost:${port}`)

apps/api/src/routes/auth.ts

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+import { Hono } from 'hono'
+
+export const authRoutes = new Hono()
+
+authRoutes.get('/session', (c) => c.json({ message: 'placeholder' }))

apps/api/src/routes/groups.ts

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+import { Hono } from 'hono'
+
+export const groupsRoutes = new Hono()
+
+groupsRoutes.get('/', (c) => c.json([]))

apps/api/src/routes/payments.ts

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+import { Hono } from 'hono'
+
+export const paymentsRoutes = new Hono()
+
+paymentsRoutes.get('/', (c) => c.json([]))

apps/api/src/routes/students.ts

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+import { Hono } from 'hono'
+
+export const studentsRoutes = new Hono()
+
+studentsRoutes.get('/', (c) => c.json([]))

apps/api/src/routes/waitlist.ts

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+import { Hono } from 'hono'
+
+export const waitlistRoutes = new Hono()
+
+waitlistRoutes.get('/', (c) => c.json([]))