refactor(main): IPC 채널 SSOT 일원화 + AppConfig 타입 강화 (WS2)

- ipc-channels.ts SSOT에 9개 그룹/키 추가: INSTRUCTION, SYSTEM_AUDIO,
  POPUP_RESULT/HISTORY/COMMAND/CAPTION, VOICE_PARTIAL, CLIPBOARD, APP,
  VOICE_CONVERSATION.FINISH_LISTENING
- WindowManager/handlers/bootstrap 하드코딩 채널 -> IPC_CHANNELS 교체.
  불일치 4건(result:* vs window:tip*)은 preload 재검증 후 SSOT로 통일.
  notifyRenderer channel: string -> IPCChannel 타입 좁힘.
- AppConfig에 7개 누락 키 추가(customInstructions, llmChains,
  voiceCommandRules, voiceCommandsEnabled, activeInstructionId,
  activeChainId, captionAudioSource) -> as never 16건 제거.
- ChainService/CustomInstructionService/WindowManager dynamic require -> static import.
- services/index.ts 데드 레지스트리 제거 (import 0건).
SKIP: ipcSuccess/ipcError 헬퍼 통일, catch 패턴(별도)
정책: docs/REFACTOR_POLICY.md DP2, DP9

apps/desktop/src/main/ipc/instruction-handlers.ts

@@ -1,32 +1,22 @@
 // src/main/ipc/instruction-handlers.ts
 
 import { ipcMain } from 'electron'
+import { IPC_CHANNELS } from '@d3ro/core/ipc-channels'
 import { ipcSuccess, ipcError, ErrorCode } from '@d3ro/core/errors'
 import { getCustomInstructionService } from '../services/CustomInstructionService'
-import type { CustomInstruction } from '../services/CustomInstructionService'
-
-// IPC_CHANNELS에 instruction 채널이 없으므로 직접 문자열 사용
-// (Phase 6 전용, 설계서 02에는 미포함)
-const CHANNELS = {
-  GET_ALL: 'instruction:getAll',
-  GET_BY_ID: 'instruction:getById',
-  CREATE: 'instruction:create',
-  UPDATE: 'instruction:update',
-  DELETE: 'instruction:delete',
-  REORDER: 'instruction:reorder'
-} as const
+import type { CustomInstruction } from '@d3ro/core/types'
 
 export function registerInstructionHandlers(): void {
-  ipcMain.handle(CHANNELS.GET_ALL, async () => {
+  ipcMain.handle(IPC_CHANNELS.INSTRUCTION.GET_ALL, async () => {
     return ipcSuccess(getCustomInstructionService().getAll())
   })
 
-  ipcMain.handle(CHANNELS.GET_BY_ID, async (_event, params: { id: string }) => {
+  ipcMain.handle(IPC_CHANNELS.INSTRUCTION.GET_BY_ID, async (_event, params: { id: string }) => {
     return ipcSuccess(getCustomInstructionService().getById(params.id))
   })
 
   ipcMain.handle(
-    CHANNELS.CREATE,
+    IPC_CHANNELS.INSTRUCTION.CREATE,
     async (
       _event,
       params: { name: string; description: string; prompt: string; icon?: string }
@@ -41,7 +31,7 @@ export function registerInstructionHandlers(): void {
   )
 
   ipcMain.handle(
-    CHANNELS.UPDATE,
+    IPC_CHANNELS.INSTRUCTION.UPDATE,
     async (_event, params: { id: string; data: Partial<CustomInstruction> }) => {
       try {
         const result = getCustomInstructionService().update(params.id, params.data)
@@ -52,7 +42,7 @@ export function registerInstructionHandlers(): void {
     }
   )
 
-  ipcMain.handle(CHANNELS.DELETE, async (_event, params: { id: string }) => {
+  ipcMain.handle(IPC_CHANNELS.INSTRUCTION.DELETE, async (_event, params: { id: string }) => {
     const result = getCustomInstructionService().delete(params.id)
     if (!result) {
       return ipcError(ErrorCode.ConfigWriteFailed, 'Cannot delete builtin instruction')
@@ -60,7 +50,7 @@ export function registerInstructionHandlers(): void {
     return ipcSuccess(undefined)
   })
 
-  ipcMain.handle(CHANNELS.REORDER, async (_event, params: { ids: string[] }) => {
+  ipcMain.handle(IPC_CHANNELS.INSTRUCTION.REORDER, async (_event, params: { ids: string[] }) => {
     getCustomInstructionService().reorder(params.ids)
     return ipcSuccess(undefined)
   })