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/bootstrap.ts

@@ -33,6 +33,8 @@ import {
 } from './windows/WindowManager'
 import { createTray } from './windows/TrayManager'
 import { registerAllIpcHandlers } from './ipc'
+import { IPC_CHANNELS } from '@d3ro/core/ipc-channels'
+import type { IPCChannel } from '@d3ro/core/ipc-channels'
 
 const logger = getLogger('bootstrap')
 
@@ -171,7 +173,7 @@ async function initPopupWindows(): Promise<void> {
       unregisterPopupNavKeys()
     } else {
       const instructions = getCustomInstructionService().getAll()
-      const activeId = configGet('activeInstructionId' as keyof import('@d3ro/core/types').AppConfig) as unknown as string
+      const activeId = configGet('activeInstructionId') as string | null
       showCommandPopup(instructions as unknown as Array<Record<string, unknown>>, activeId || null)
       registerPopupNavKeys('command')
     }
@@ -250,7 +252,7 @@ async function initVoiceMode(): Promise<void> {
     }
 
     // 렌더러 UI 갱신 알림 (Dashboard 통계 + History 목록)
-    notifyRenderer('app:dataChanged', { type: 'session-completed' })
+    notifyRenderer(IPC_CHANNELS.APP.DATA_CHANGED, { type: 'session-completed' })
   })
 
   voiceMode.on('session-cancelled', ({ reason }) => {
@@ -268,7 +270,7 @@ async function initVoiceMode(): Promise<void> {
 }
 
 /** 메인 윈도우 렌더러에 UI 갱신 이벤트 전송 */
-function notifyRenderer(channel: string, data?: Record<string, unknown>): void {
+function notifyRenderer(channel: IPCChannel, data?: Record<string, unknown>): void {
   const win = getMainWindow()
   if (win && !win.isDestroyed()) {
     win.webContents.send(channel, data ?? {})
@@ -330,13 +332,13 @@ async function initMeetingMode(): Promise<void> {
 
 function setupHistoryPopupIPC(): void {
   // 히스토리 팝업 열기 (핫키에서 호출)
-  ipcMainRef.on('history:showPopup', () => {
+  ipcMainRef.on(IPC_CHANNELS.POPUP_HISTORY.SHOW_POPUP, () => {
     const entries = getHistoryService().list({ page: 0, pageSize: 10 }).entries
     showHistoryPopup(entries as unknown as Array<Record<string, unknown>>)
   })
 
   // 아이템 선택 → 텍스트 삽입
-  ipcMainRef.on('history:itemSelected', (_event: Electron.IpcMainEvent, data: { text: string }) => {
+  ipcMainRef.on(IPC_CHANNELS.POPUP_HISTORY.ITEM_SELECTED, (_event: Electron.IpcMainEvent, data: { text: string }) => {
     hideHistoryPopup()
     unregisterPopupNavKeys()
     setTimeout(async () => {
@@ -349,7 +351,7 @@ function setupHistoryPopupIPC(): void {
   })
 
   // 팝업 닫기
-  ipcMainRef.on('history:popupDismissed', () => {
+  ipcMainRef.on(IPC_CHANNELS.POPUP_HISTORY.POPUP_DISMISSED, () => {
     hideHistoryPopup()
     unregisterPopupNavKeys()
   })
@@ -359,28 +361,28 @@ function setupHistoryPopupIPC(): void {
 
 function setupCommandPopupIPC(): void {
   // 명령어 선택 → 활성 명령어로 설정
-  ipcMainRef.on('command:selected', (_event: Electron.IpcMainEvent, data: { id: string; name: string }) => {
+  ipcMainRef.on(IPC_CHANNELS.POPUP_COMMAND.SELECTED, (_event: Electron.IpcMainEvent, data: { id: string; name: string }) => {
     hideCommandPopup()
     unregisterPopupNavKeys()
 
     if (data.id) {
       // 명령어 선택 → 활성 명령어로 설정
-      configSet('activeInstructionId' as keyof import('@d3ro/core/types').AppConfig, data.id as never)
+      configSet('activeInstructionId', data.id)
       configSet('defaultLLMAction', 'custom')
       logger.info(`Active command set: ${data.name} (${data.id})`)
     } else {
       // 선택 해제 → 명령어 없음 (원본 삽입)
-      configSet('activeInstructionId' as keyof import('@d3ro/core/types').AppConfig, '' as never)
+      configSet('activeInstructionId', '')
       configSet('defaultLLMAction', 'none')
       logger.info('Active command cleared (none)')
     }
 
     // CMD 페이지 UI 갱신 알림
-    notifyRenderer('app:dataChanged', { type: 'command-changed', activeId: data.id })
+    notifyRenderer(IPC_CHANNELS.APP.DATA_CHANGED, { type: 'command-changed', activeId: data.id })
   })
 
   // 팝업 닫기
-  ipcMainRef.on('command:dismissed', () => {
+  ipcMainRef.on(IPC_CHANNELS.POPUP_COMMAND.DISMISSED, () => {
     hideCommandPopup()
     unregisterPopupNavKeys()
   })