feat(rewrite): bootstrap monorepo Bun + port domain layer ke TypeScript

Mulai migrasi Zesdex dari Rust ke TypeScript/Bun.

- Root workspace package.json, tsconfig strict, bun.lock, gitignore fix
- Paket @zesdex/domain (apps/packages/domain):
  - core: ChatMessage/Conversation/ToolCall/SseParser/repairJson/
    sanitizeToolArguments/UsageStats/Store/DomainError
  - auth: Session/SessionId/SessionLock/OAuth + repository & service interfaces
  - cms: AppConfig/Settings/SettingsPatch/Memory/EditLog + repository &
    service interfaces
  - agent: TurnEvent/SessionRuntime/AgentTurnParams/AgentProgress/prompt
  - subagent & workflow models
- Wire-shape JSON disamakan dengan Rust (serde rename/flatten/skip_if)
- 27 unit test Bun port dari test Rust (SseParser, repair_json, resolve_effective_model, session id)

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

apps/packages/domain/src/cms/error.ts

@@ -0,0 +1,34 @@
+/**
+ * Domain error types for the CMS module. Mirrors `cms/error.rs`.
+ */
+import type { DomainError } from "../core/error.ts";
+
+/** Shared repository error type for CMS persistence. */
+export type RepositoryError = DomainError;
+
+/** Errors from service / use-case operations in the CMS domain. */
+export type ServiceError =
+  | { kind: "repository"; error: DomainError }
+  | { kind: "invalid_input"; message: string }
+  | { kind: "other"; message: string };
+
+export function cmsRepositoryErr(err: DomainError): ServiceError {
+  return { kind: "repository", error: err };
+}
+export function invalidInput(message: string): ServiceError {
+  return { kind: "invalid_input", message };
+}
+export function cmsOther(message: string): ServiceError {
+  return { kind: "other", message };
+}
+
+export function cmsServiceErrorToString(e: ServiceError): string {
+  switch (e.kind) {
+    case "repository":
+      return `repository error: ${e.error.message}`;
+    case "invalid_input":
+      return `invalid input: ${e.message}`;
+    case "other":
+      return e.message;
+  }
+}