feat: port session 11 — Accounts & Directory JWT Store
- Account: full Account class (200 features) with subject mappings, connection counting, export/import checks, expiration timers - DirJwtStore: directory-based JWT storage with sharding and expiry - AccountResolver: IAccountResolver, MemoryAccountResolver, UrlAccountResolver, DirAccountResolver, CacheDirAccountResolver - AccountTypes: all supporting types (AccountLimits, SConns, ExportMap, ImportMap, ServiceExport, StreamExport, ServiceLatency, etc.) - 34 unit tests (599 total), 234 features complete (IDs 150-349, 793-826)
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