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/schemas/task.py

@@ -1,7 +1,9 @@
 from __future__ import annotations
 
 from datetime import datetime, timezone
+from enum import Enum
 from typing import Any, Literal
+from uuid import uuid4
 
 from pydantic import BaseModel, Field
 
@@ -13,6 +15,18 @@ InterruptStatus = Literal["requested", "acknowledged", "resolved"]
 BudgetMode = Literal["direct", "collaboration"]
 
 
+class CodeProviderType(str, Enum):
+    CLAUDE = "claude"
+    GEMINI = "gemini"
+    CODEX = "codex"
+    OPENCODE = "opencode"
+
+
+class RiskLevelType(str, Enum):
+    LOW = "low"
+    HIGH = "high"
+
+
 class InterruptRecord(BaseModel):
     interrupt_id: str
     reason: str
@@ -83,3 +97,37 @@ class TaskResult(BaseModel):
     budget_snapshot: CollaborationBudget | dict[str, Any] | None = None
     next_action: str | None = None
     output_data: dict[str, Any] | None = None
+
+
+class CodeTaskType(str, Enum):
+    DEMO = "demo"
+    PROJECT = "project"
+    MODIFICATION = "modification"
+
+
+class CodeTask(BaseModel):
+    """代码任务请求模型"""
+
+    task_id: str = Field(default_factory=lambda: str(uuid4()))
+    task_type: CodeTaskType
+    ai_provider: CodeProviderType
+    sandbox_mode: bool = False
+    workspace_path: str | None = None
+    user_prompt: str
+    parent_task_id: str | None = None
+    thread_id: str | None = None
+    message_id: str | None = None
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+
+
+class CodeExecutionResultSchema(BaseModel):
+    """代码执行结果模型 (API 响应用)"""
+
+    success: bool
+    message: str
+    files_created: list[str] = Field(default_factory=list)
+    output: str = ""
+    error: str | None = None
+    exit_code: int = 0
+    execution_time: float | None = None
+    sandbox_session_id: str | None = None