feat: 실거래가 원본 데이터를 S3에 적재하는 수집 파이프라인 추가

[ehdrb92]

Summary

• 공공데이터포털(RTMS 8개 API)에서 실거래가를 직접 수집하고, 행정표준코드관리시스템에서 법정동 코드를 조회하는 단계를 추가
• 파이프라인을 법정동 코드 갱신 -> 수집(API -> S3) -> 적재(S3 -> DB) 3단계로 확장 (run_scheduled_pipeline)
• main.py에 있던 수집/변환/적재 로직을 app/scheduler 패키지(collect.py, legal_dong.py, transform.py, ingest.py, jobs.py)로 분리
• 환경 설정을 app/config.py의 pydantic-settings(Settings)로 통일 (DATABASE_URL, S3_BUCKET, S3_PREFIX, DATA_GO_KR_SERVICE_KEY), .env.example 추가
• boto3, defusedxml, requests, pydantic-settings 의존성 추가

Test plan

• ruff format ., ruff check . 통과
• 로컬 환경변수(.env) 구성 후 run_scheduled_pipeline 수동 실행으로 S3 업로드/DB 적재 확인

Closes #2

🤖 Generated with Claude Code

https://claude.ai/code/session_017vjm8qqWBxUGvzb5kkGQfu

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud