chore: bump version to v2026.4.306 and document ReJSON support}
- Bump version from v2026.4.305 to v2026.4.306 in package.json and all doc footers - Add ReJSON (JSON data type) to Pro and Enterprise tier feature lists - Add backend enforcement note for ReJSON operations (key-get, key-new-or-set, key-json-set) - Add new "Redis 8 ReJSON Support" section documenting module detection, JSON key icon, CRUD operations, and tier gating - Add v2026.4.306 changelog entry for improved changelog tooling and submodule alignment - Update build version references across README, artifacts, changelogs, and contributors docs