REFACTOR(repo): simplify project structure

- Move services/backend to langgraph/
- Move deploy/docker/Dockerfile to Dockerfile
- Remove deploy/, services/ folders
- Update GitHub Actions workflow paths
- Remove kustomization update logic (managed by K3S-HOME/applications)

langgraph/tools/bash_tool.py

@@ -0,0 +1,132 @@
+"""
+Bash 명령어 실행 도구
+"""
+import subprocess
+import shlex
+from langchain_core.tools import tool
+from typing import Optional
+
+
+@tool
+def execute_bash(command: str, timeout: int = 30, cwd: Optional[str] = None) -> str:
+    """
+    Execute a bash command in the container.
+
+    Args:
+        command: Bash command to execute
+        timeout: Command timeout in seconds (default: 30)
+        cwd: Working directory (default: None)
+
+    Returns:
+        Command output or error message
+
+    Examples:
+        - execute_bash("ls -la /app")
+        - execute_bash("python --version")
+        - execute_bash("curl -s http://prometheus:9090/api/v1/query?query=up")
+    """
+    try:
+        result = subprocess.run(
+            command,
+            shell=True,
+            capture_output=True,
+            text=True,
+            timeout=timeout,
+            cwd=cwd
+        )
+
+        # Combine stdout and stderr
+        output = result.stdout
+        if result.stderr:
+            output += f"\n[STDERR]:\n{result.stderr}"
+
+        if result.returncode != 0:
+            return f"❌ Command failed (exit code {result.returncode}):\n{output}"
+
+        return f"✅ Command executed successfully:\n{output}"
+
+    except subprocess.TimeoutExpired:
+        return f"❌ Command timed out after {timeout} seconds"
+    except Exception as e:
+        return f"❌ Error executing command: {str(e)}"
+
+
+@tool
+def execute_host(command: str, timeout: int = 30, use_sudo: bool = False) -> str:
+    """
+    Execute command on the HOST system using nsenter (NO SSH needed!).
+
+    USE THIS for accessing the host system:
+    - kubectl commands (Kubernetes cluster management)
+    - Accessing /home/ubuntu/Projects/ (Git repositories)
+    - PostgreSQL queries (via psql)
+    - Git operations on host repositories
+    - File system operations on host
+    - ALL host system operations
+
+    This works by entering the host's namespaces directly from the container.
+    Much faster than SSH and no authentication needed!
+    
+    NOTE: Projects folder is located at /home/ubuntu/Projects/ on oracle-master server.
+
+    Args:
+        command: Command to run on the host system
+        timeout: Command timeout in seconds (default: 30)
+        use_sudo: Whether to prepend 'sudo' to the command (default: False)
+
+    Returns:
+        Command output or error message
+
+    Examples:
+        - execute_host("kubectl get pods -n mas", use_sudo=True)
+        - execute_host("ls -la /home/ubuntu/Projects")
+        - execute_host("cat /home/ubuntu/Projects/mas/README.md")
+        - execute_host("cd /home/ubuntu/Projects/mas && git log -5 --oneline")
+        - execute_host("psql -U bluemayne -h postgresql-primary.postgresql.svc.cluster.local -d postgres -c 'SELECT version()'")
+    """
+    try:
+        # Use nsenter to enter host namespaces
+        # -t 1: target PID 1 (init process on host)
+        # -m: mount namespace
+        # -u: UTS namespace (hostname)
+        # -n: network namespace
+        # -i: IPC namespace
+        # Run as ubuntu user to avoid git "dubious ownership" errors
+        # Use 'su ubuntu -c' (without -) to preserve current directory context
+        # This allows commands to work from SSH initial directory
+        if use_sudo:
+            # For sudo commands, run directly with sudo
+            # Use shlex.quote to safely quote the command while preserving shell expansion
+            nsenter_command = f"nsenter -t 1 -m -u -n -i -- sh -c {shlex.quote(f'sudo {command}')}"
+        else:
+            # For regular commands, run as ubuntu user
+            # Use 'su ubuntu -c' (not 'su - ubuntu -c') to preserve current directory
+            # This matches SSH behavior where you start from the initial directory
+            nsenter_command = f"nsenter -t 1 -m -u -n -i -- su ubuntu -c {shlex.quote(command)}"
+
+        result = subprocess.run(
+            nsenter_command,
+            shell=True,
+            capture_output=True,
+            text=True,
+            timeout=timeout
+        )
+
+        # Combine stdout and stderr
+        output = result.stdout
+        if result.stderr:
+            output += f"\n[STDERR]:\n{result.stderr}"
+
+        if result.returncode != 0:
+            return f"❌ Host command failed (exit code {result.returncode}):\n{output}"
+
+        return f"✅ Host command executed successfully:\n{output}"
+
+    except subprocess.TimeoutExpired:
+        return f"❌ Host command timed out after {timeout} seconds"
+    except Exception as e:
+        return f"❌ Error executing host command: {str(e)}"
+
+
+# Export both tools
+bash_tools = [execute_bash, execute_host]