feat(backend): add tRPC with Hono adapter

- Add @trpc/server, @hono/trpc-server, zod dependencies
- Create tRPC context with BetterAuth session
- Create router with publicProcedure and protectedProcedure
- Mount tRPC at /trpc/* via Hono adapter

Co-authored-by: Ona <no-reply@ona.com>

apps/aris-backend/src/trpc/router.ts

@@ -0,0 +1,5 @@
+import { router } from "./trpc.ts"
+
+export const appRouter = router({})
+
+export type AppRouter = typeof appRouter