feat: Implement automated keyword-based news pipeline scheduler

- Add multi-threaded keyword scheduler for periodic news collection
- Create Keyword Manager API for CRUD operations and monitoring
- Implement automatic pipeline triggering (RSS → Google → AI → Translation)
- Add thread status monitoring and dynamic keyword management
- Support priority-based execution and configurable intervals
- Add comprehensive scheduler documentation guide
- Default keywords: AI, 테크놀로지, 경제, 블록체인

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

services/pipeline/scheduler/Dockerfile

@@ -2,18 +2,15 @@ FROM python:3.11-slim
 
 WORKDIR /app
 
-# 의존성 설치
+# Install dependencies
 COPY ./scheduler/requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt
 
-# 공통 모듈 복사
+# Copy shared module
 COPY ./shared /app/shared
 
-# 스케줄러 코드 복사
+# Copy scheduler code
 COPY ./scheduler /app
 
-# 환경변수
-ENV PYTHONUNBUFFERED=1
-
-# 실행
-CMD ["python", "scheduler.py"]
+# Run scheduler
+CMD ["python", "keyword_scheduler.py"]