docs(FN-923): update README with all current features and capabilities
- Rewrite README to reflect current feature set including multi-project support, central database architecture, and hybrid executor runtime - Document SQLite storage, WAL mode, auto-migration from legacy file-based storage - Add sections for CLI usage, dashboard features, settings hierarchy, workflow steps, and model presets - Cover archive cleanup, backup automation, stuck task detection, and badge WebSockets - Remove outdated content and consolidate into accurate, comprehensive documentation
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