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/ai-article-generator/Dockerfile

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+FROM python:3.11-slim
+
+WORKDIR /app
+
+# 의존성 설치
+COPY ./ai-article-generator/requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# 공통 모듈 복사
+COPY ./shared /app/shared
+
+# AI Article Generator 코드 복사
+COPY ./ai-article-generator /app
+
+# 환경변수
+ENV PYTHONUNBUFFERED=1
+
+# 실행
+CMD ["python", "ai_article_generator.py"]