feat(agents): implement Code Commander module (Phases 1-5)

- Phase 1: Infrastructure (state, prompts, registry)
- Phase 2: Execution engine (AI adapters, security classifier, executors)
- Phase 3: Agent integration (graph nodes, routing)
- Phase 4: Streaming interaction (PTY terminal, WebSocket)
- Phase 5: Frontend integration (Vue components)

backend/app/agents/tools/direct_executor.py

@@ -0,0 +1,112 @@
+"""
+Direct Executor - 直接执行器
+用于低风险任务，直接执行不隔离
+"""
+
+import asyncio
+import os
+import shutil
+import tempfile
+from pathlib import Path
+from typing import AsyncGenerator
+
+from app.agents.tools.ai_adapter import AICLIAdapter
+
+
+class ExecutionResult:
+    """执行结果"""
+
+    def __init__(
+        self,
+        success: bool,
+        exit_code: int,
+        stdout: str,
+        stderr: str,
+    ):
+        self.success = success
+        self.exit_code = exit_code
+        self.stdout = stdout
+        self.stderr = stderr
+
+
+class DirectExecutor:
+    """直接执行器（用于低风险任务）"""
+
+    def __init__(self, adapter: AICLIAdapter, timeout: int = 60):
+        self.adapter = adapter
+        self.timeout = timeout
+
+    async def execute(
+        self,
+        prompt: str,
+    ) -> AsyncGenerator[str, None]:
+        """
+        直接执行，不需要沙盒
+
+        Args:
+            prompt: 任务描述
+
+        Yields:
+            str: 实时输出
+        """
+        # 1. 检查 CLI 是否安装
+        if not self.adapter.is_installed():
+            yield f"[ERROR] {self.adapter.cli_name} is not installed\n"
+            yield f"[ERROR] Please install {self.adapter.cli_name} first\n"
+            return
+
+        # 2. 构建命令
+        cmd = self.adapter.build_command(prompt, None)
+
+        # 3. 异步执行，实时 yield 输出
+        process = await asyncio.create_subprocess_exec(
+            *cmd,
+            stdout=asyncio.subprocess.PIPE,
+            stderr=asyncio.subprocess.PIPE,
+            env={**os.environ, "TERM": "xterm-256color"},
+        )
+
+        # 4. 实时读取输出
+        stdout_lines = []
+        stderr_lines = []
+
+        while True:
+            try:
+                line_bytes = await asyncio.wait_for(
+                    process.stdout.readline(),
+                    timeout=self.timeout,
+                )
+                if not line_bytes:
+                    break
+                line = line_bytes.decode("utf-8", errors="replace")
+                stdout_lines.append(line)
+                yield line
+            except asyncio.TimeoutError:
+                process.kill()
+                yield f"\n[ERROR] Execution timed out after {self.timeout}s\n"
+                break
+
+        # 5. 读取 stderr
+        stderr_bytes = await process.communicate()
+        if stderr_bytes[1]:
+            stderr = stderr_bytes[1].decode("utf-8", errors="replace")
+            stderr_lines.append(stderr)
+            yield f"\n[STDERR]\n{stderr}\n"
+
+        # 6. 完成标记
+        yield f"\n[EXIT_CODE] {process.returncode or 0}\n"
+        yield f"\n[COMPLETE] success={process.returncode == 0}\n"
+
+    async def execute_sync(self, prompt: str) -> ExecutionResult:
+        """同步执行并返回完整结果"""
+        output_parts = []
+        async for line in self.execute(prompt):
+            output_parts.append(line)
+
+        output = "".join(output_parts)
+        return ExecutionResult(
+            success="[COMPLETE] success=True" in output,
+            exit_code=0,
+            stdout=output,
+            stderr="",
+        )