FEAT(app): add SSH tool for host access

- Add execute_ssh tool for accessing host system (oracle-master)
- Update all agent prompts to explain container vs host environment
- Research Agent: Guide to use SSH for kubectl, Projects, PostgreSQL
- Code Agents: Guide to use SSH for file creation and Git operations
- Infrastructure Agent: Guide to use SSH for YAML files and kubectl
- Orchestrator: Add system environment context

This fixes:
- kubectl 'Exec format error' (now uses SSH with sudo)
- /app/repos/ not found (now uses /home/ubuntu/Projects/)
- PostgreSQL connection errors (now uses correct host address)
- Git repository access issues (now uses SSH to access host repos)

Example usage:
- execute_ssh('kubectl get pods -n mas', use_sudo=True)
- execute_ssh('ls -la /home/ubuntu/Projects')
- execute_ssh('cd /home/ubuntu/Projects/mas && git status')

deploy/k8s/overlays/prod/kustomization.yaml

@@ -16,5 +16,5 @@ commonLabels:
 # 이미지 태그 설정 (ArgoCD Image Updater가 자동으로 업데이트)
 images:
   - name: gitea0213.kro.kr/bluemayne/mas
-    newTag: main-sha-bc8ae78efc0a375931c73d5c1edbde2b410e4231
+    newTag: main-sha-761478757e461a432dc761b4c9d9cef8bc811d7b