release: v0.31.0 — family-contacts integration & settings restructure

- Family member records now store phone, email, and birthday, auto-synced
  to Contacts and Birthdays modules (PR #99 by @rafaelfoster)
- Settings gets dedicated Family and API Tokens tabs (admin-only)
- Avatar editor redesigned with icon buttons; tab bar fits standard width
- Dentist calendar icon normalised to 'tooth'; theme reset bug fixed
- i18n: missing family field translations added to 12 locales

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "oikos",
-  "version": "0.30.3",
+  "version": "0.31.0",
   "description": "Self-hosted family planner - calendar, tasks, shopping, meal planning, budget and more. Private, open-source, no subscription.",
   "main": "server/index.js",
   "type": "module",