feat(home): implement home summary feature with routes and use case

- Added home routes and corresponding route handler for fetching home summary.
- Created GetHomeSummary use case to aggregate user data including groups, attendees, and upcoming payments.
- Introduced HomeSummaryDto and related schemas for data validation.
- Implemented nextClassOccurrence function to determine the next class based on user timezone.
- Added tests for home summary functionality and next class occurrence logic.

apps/backend/src/modules/home/features/get-summary/route.ts

@@ -0,0 +1,23 @@
+import type { HomeQuery } from '@gruperly/shared';
+import { HomeQuerySchema } from '@gruperly/shared';
+import { Hono } from 'hono';
+import { problemJson, resultJson, unauthorizedProblem } from '@/http/problem-details';
+import { validate } from '@/http/validate';
+import { GetHomeSummary } from './use-case';
+
+const route = new Hono();
+
+route.get('/', validate.query(HomeQuerySchema), async (c) => {
+  const user = c.get('user');
+  if (!user) {
+    return problemJson(c, unauthorizedProblem(c.req.path));
+  }
+
+  const query = c.req.valid('query') as HomeQuery;
+  const useCase = new GetHomeSummary();
+  const result = await useCase.execute(user.id, query);
+
+  return resultJson(c, result);
+});
+
+export default route;