v0.2.0 of ichibase

Official client-side SDK for ichibase — Postgres, MongoDB, Auth, Storage and Realtime from Flutter, Dart server, or CLI. Anon key only. Changelog excerpt: - Automatic session persistence — no storeneeded. The SDK now picks a durable default per platform (a file on mobile/desktop/server via dart:io, localStorageon web). Pass store:only to override. - Ichibase.initialize(url, anonKey)+ Ichibase.instance— initialize once at startup, then use the client anywhere with no BuildContext(Supabase-style). createClient(...)still available for local instances. - Example app updated to the singleton + a full feature tour.