ADMIN FAMILY LINKING ACCESS
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1. Sidebar:
   Admin -> People -> Family Linking
   Route: /admin/family-linking

2. Students page:
   Admin -> Students
   - Family Linking button in the page header
   - Open Family Linking card under the page header
   - Family button on each student row

3. Compatibility route:
   /admin/families also opens the same Family Linking page.

Backend required:
- GET/POST/PUT /families.php
- students.family_id in student responses
- families table + students.family_id migration

If /families.php is not deployed yet, the page will open but will show a backend loading error until that endpoint is implemented.
