Phase 12~13 전체 구현: Pro+ 피처 6종 + 음성 대화 + RAG + OS 자동화

Phase 12:
- FileTranscriptionService: ffmpeg PCM 변환 + 30초 청크 순차 STT
- MeetingSummaryService: 자막 세션 → LLM 자동 요약 + DB summaryText
- DictationTemplateService: 필드별 음성 입력 상태 머신 + 프리셋 3개

Phase 13.1:
- VoiceConversationService: STT→Ollama /api/chat→TTS 대화 루프 (10턴)
- TTSPlaybackService: Windows SAPI 문장 단위 큐 재생
- LocalLLMService.chatStream: Ollama /api/chat 스트리밍

Phase 13.2:
- RAGService: Ollama 임베딩 + SQLite 벡터 + 코사인 유사도 검색
- KnowledgeBasePage: 문서 관리 + 질문/답변 UI
- PDF 파서: zlib FlateDecode 해제 + BT/ET 텍스트 추출

Phase 13.3:
- VoiceActionService: LLM JSON 액션 플랜 생성 + 실행
- 프리셋 6개 (크롬/메모장/탐색기/볼륨), 위험 명령 차단

공통: IPC ~70채널, 에러코드 780-878, i18n 100+키
버그픽스: 라이선스 로컬 키 우선, i18n featureLabel, DOM 중첩

src/shared/errors.ts

@@ -113,6 +113,44 @@ export enum ErrorCode {
   CaptionAlreadyActive = 771,
   CaptionSTTFailed = 772,
 
+  // === Phase 12: File Transcription (780-784) ===
+  FileTranscriptionFFmpegFailed = 780,
+  FileTranscriptionInvalidFormat = 781,
+  FileTranscriptionChunkFailed = 782,
+  FileTranscriptionCancelled = 783,
+  FileTranscriptionFileTooLarge = 784,
+
+  // === Phase 12: Meeting Summary (785-789) ===
+  MeetingSummaryGenerationFailed = 785,
+  MeetingSummaryNoTranscript = 786,
+  MeetingSummaryExportFailed = 787,
+
+  // === Phase 12: Dictation Template (790-794) ===
+  TemplateNotFound = 790,
+  TemplateSessionAlreadyActive = 791,
+  TemplateSessionNotActive = 792,
+  TemplateFieldRecordingFailed = 793,
+  TemplateInvalidFormat = 794,
+
+  // === Phase 13: Voice Conversation (795-799) ===
+  ConversationSessionAlreadyActive = 795,
+  ConversationNoActiveSession = 796,
+  ConversationTTSFailed = 797,
+  ConversationLLMFailed = 798,
+
+  // === Phase 13: Local RAG (870-874) ===
+  RAGDocumentNotFound = 870,
+  RAGIndexingFailed = 871,
+  RAGEmbeddingFailed = 872,
+  RAGQueryFailed = 873,
+  RAGUnsupportedFormat = 874,
+
+  // === Phase 13: Voice Action (875-879) ===
+  VoiceActionPlanFailed = 875,
+  VoiceActionExecutionFailed = 876,
+  VoiceActionBlocked = 877,
+  VoiceActionInvalidPlan = 878,
+
   // === Config (800-849) ===
   ConfigReadFailed = 800,
   ConfigWriteFailed = 801,