v1.0.0 of cache_nexus

Offline-first, debuggable data orchestration layer for Flutter. Features TTL caching, 5 cache policies, encryption, auth-aware isolation, reactive streams, offline sync, and built-in dev tools. Changelog excerpt: - Initial release of Smart Cache - Two-tier storage: in-memory (MemoryCacheStorage) + persistent (HiveCacheStorage) - 5 cache policies: cacheFirst, networkFirst, cacheOnly, networkOnly, staleWhileRevalidate - TTL-based automatic cache expiration - Request deduplication for concurrent identical requests - Security layer: SecureCacheStorage with encryption + compression decorators - Auth-aware caching: CacheContext for user/role-based cache isolation - Reactive streams: watch() API with CacheNexus[...]