chore: Archive 7 unused workflows and consolidate to SSOT pipeline

Reorganized .gitea/workflows/ to reduce duplication and noise:
- Archived 7 unnecessary workflows to .archived/ subdirectory:
  - auto_backup_schedule.yml
  - backup.yml
  - calibration_backlog.yml
  - kis_data_collection.yml
  - qualitative_sell_strategy.yml
  - snapshot_admin.yml
  - wbs_9_3_null_policy_ci_gate.yml

Active workflows (5 total):
- merge-to-main.yml (SSOT 5-stage pipeline)
- ci.yml (PR validation)
- deploy-prod.yml (manual deployment)
- fast-validation.yml (PR fast checks)
- _common/build-and-test.yml (reusable component)

Rationale: Phase 2 deployment infrastructure is complete. Legacy workflows
are no longer needed, reducing CI/CD maintenance burden and improving clarity.
Archived workflows remain available for reference if rollback is needed.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

.gitea/workflows/auto_backup_schedule.yml

@@ -1,172 +0,0 @@
-name: Auto Backup - WBS-9.7
-
-on:
-  schedule:
-    # 매일 자정 (UTC)
-    - cron: '0 0 * * *'
-  workflow_dispatch:
-
-jobs:
-  daily-backup:
-    runs-on: ubuntu-latest
-    name: Daily Backup
-
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v3
-        with:
-          fetch-depth: 0
-
-      - name: Setup Python
-        run: |
-          python --version
-
-      - name: Run Daily Backup
-        run: |
-          python tools/backup_recovery_manager_v1.py
-
-      - name: Cleanup Old Backups
-        run: |
-          python -c "
-          from tools.backup_recovery_manager_v1 import BackupRecoveryManager
-          manager = BackupRecoveryManager(retention_days=30)
-          result = manager.cleanup_old_backups()
-          print(f'Cleanup: {result}')
-          "
-
-      - name: Log Backup Result
-        if: always()
-        run: |
-          echo "Backup completed at $(date)"
-          ls -lh backups/ | tail -5
-
-  weekly-full-backup:
-    runs-on: ubuntu-latest
-    name: Weekly Full Backup
-
-    # 매주 월요일 1:00 UTC
-    schedule:
-      - cron: '0 1 * * 1'
-
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v3
-
-      - name: Setup Python
-        run: python --version
-
-      - name: Create Weekly Full Backup
-        run: |
-          python -c "
-          from tools.backup_recovery_manager_v1 import BackupRecoveryManager
-          from pathlib import Path
-
-          manager = BackupRecoveryManager()
-          result = manager.create_weekly_full_backup()
-          print(f'Weekly backup: {result}')
-
-          # 신뢰성 테스트
-          if 'backup_name' in result:
-              integrity = manager.test_backup_integrity(result['backup_name'])
-              print(f'Integrity: {integrity}')
-          "
-
-      - name: Backup to Cloud (Optional)
-        continue-on-error: true
-        run: |
-          # 원격 백업 서버로 동기화 (설정 필요)
-          # rsync -av backups/ admin@BACKUP_SERVER_IP:/backup/data_feed/
-          echo "Cloud sync would run here if configured"
-
-      - name: Notify Completion
-        if: success()
-        run: |
-          echo "Weekly backup completed successfully"
-          df -h | grep -E "Filesystem|data"
-
-  backup-health-check:
-    runs-on: ubuntu-latest
-    name: Backup Health Check
-
-    # 매일 12:00 UTC
-    schedule:
-      - cron: '0 12 * * *'
-
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v3
-
-      - name: Check Backup Integrity
-        run: |
-          python -c "
-          from tools.backup_recovery_manager_v1 import BackupRecoveryManager
-          from pathlib import Path
-
-          manager = BackupRecoveryManager()
-
-          # 가장 최근 백업 확인
-          backups = sorted(Path('backups/').glob('*'), key=lambda p: p.stat().st_mtime, reverse=True)
-
-          if backups:
-              latest = backups[0].name
-              print(f'Latest backup: {latest}')
-
-              integrity = manager.test_backup_integrity(latest)
-              print(f'Status: {integrity.get(\"status\")}')
-
-              if integrity.get('database_integrity') != 'ok':
-                  print('WARNING: Database integrity issue detected')
-          else:
-              print('ERROR: No backups found')
-          "
-
-      - name: Log Backup Statistics
-        run: |
-          echo "=== Backup Statistics ==="
-          find backups/ -type f -name "metadata.json" | wc -l
-          du -sh backups/ | awk '{print "Total size: " $1}'
-
-  test-recovery:
-    runs-on: ubuntu-latest
-    name: Monthly Recovery Test
-
-    # 매월 1일 2:00 UTC
-    schedule:
-      - cron: '0 2 1 * *'
-
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v3
-
-      - name: Test Recovery Procedure
-        run: |
-          python -c "
-          from tools.backup_recovery_manager_v1 import BackupRecoveryManager
-          from pathlib import Path
-          import tempfile
-
-          manager = BackupRecoveryManager()
-
-          # 가장 최근 백업에서 복구 테스트
-          backups = sorted(Path('backups/').glob('*'), key=lambda p: p.stat().st_mtime, reverse=True)
-
-          if backups:
-              test_backup = backups[0].name
-
-              # 임시 디렉토리에 복구
-              with tempfile.TemporaryDirectory() as tmpdir:
-                  result = manager.restore_from_backup(test_backup, tmpdir)
-                  print(f'Recovery test: {result.get(\"status\")}')
-                  print(f'Recovery time: {result.get(\"recovery_time_seconds\")}s')
-
-                  if result.get('status') == 'SUCCESS':
-                      print('Recovery procedure validated')
-                  else:
-                      print('ERROR: Recovery test failed')
-          "
-
-      - name: Document Recovery Capability
-        run: |
-          echo "Monthly recovery test completed"
-          echo "Recovery time target: < 1 hour"
-          echo "Success rate target: 99%"