feat(rewrite): tambah application layer — port traits & use cases TypeScript

Paket @zesdex/application (apps/packages/application):
- ports: ProviderService (chat/chatStream+abort), PasswordService,
  TokenService, AuthService
- agent: AgentTurnServiceImpl (loop 50 iterasi, auto-compact 60k chars,
  adaptive max-tokens 800/1600/4096, temp 0.2/0.7, ErrorTracker,
  eksekusi tool read-only paralel terbatas mempertahankan urutan)
  + compact_messages_with_ai
- auth: OAuthUseCase (PKCE S256 + CSRF state), SessionServiceImpl
- cms: ConversationServiceImpl, MemoryServiceImpl, SettingsServiceImpl
- 11 unit test Bun (PKCE, OAuth CSRF, turn_service helper)
- tsconfig paths untuk workspace @zesdex/*

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

apps/packages/application/src/auth/index.ts

@@ -0,0 +1,3 @@
+/** Auth application module — OAuth PKCE + session management use-cases. */
+export * from "./oauth_service.ts";
+export * from "./session_service.ts";