feat: initial XCClaw基础架构

- 基于 FastAPI 的 Web API 服务
- OpenCode API 客户端封装
- 会话管理器（同步/异步任务执行）
- APScheduler 定时任务调度
- 完整的 REST API 端点

app/services/opencode_client.py

@@ -0,0 +1,88 @@
+from typing import Any
+import httpx
+from app.core.config import settings
+from app.core.logging import logger
+
+
+class OpenCodeClient:
+    def __init__(self):
+        self.base_url = f"http://{settings.opencode_host}:{settings.opencode_port}"
+        self._client: httpx.AsyncClient | None = None
+
+    async def _get_client(self) -> httpx.AsyncClient:
+        if self._client is None:
+            headers = {}
+            if settings.opencode_password:
+                headers["Authorization"] = f"Bearer {settings.opencode_password}"
+            self._client = httpx.AsyncClient(
+                base_url=self.base_url,
+                headers=headers,
+                timeout=300.0,
+            )
+        return self._client
+
+    async def close(self):
+        if self._client:
+            await self._client.aclose()
+            self._client = None
+
+    async def health_check(self) -> dict[str, Any]:
+        client = await self._get_client()
+        resp = await client.get("/global/health")
+        resp.raise_for_status()
+        return resp.json()
+
+    async def create_session(self, title: str | None = None, parent_id: str | None = None) -> dict[str, Any]:
+        client = await self._get_client()
+        payload = {}
+        if title:
+            payload["title"] = title
+        if parent_id:
+            payload["parentID"] = parent_id
+        resp = await client.post("/session", json=payload)
+        resp.raise_for_status()
+        return resp.json()
+
+    async def get_session(self, session_id: str) -> dict[str, Any]:
+        client = await self._get_client()
+        resp = await client.get(f"/session/{session_id}")
+        resp.raise_for_status()
+        return resp.json()
+
+    async def delete_session(self, session_id: str) -> bool:
+        client = await self._get_client()
+        resp = await client.delete(f"/session/{session_id}")
+        resp.raise_for_status()
+        return resp.json()
+
+    async def send_message(self, session_id: str, text: str) -> dict[str, Any]:
+        client = await self._get_client()
+        payload = {
+            "parts": [{"type": "text", "text": text}]
+        }
+        resp = await client.post(f"/session/{session_id}/message", json=payload)
+        resp.raise_for_status()
+        return resp.json()
+
+    async def send_message_async(self, session_id: str, text: str) -> None:
+        client = await self._get_client()
+        payload = {
+            "parts": [{"type": "text", "text": text}]
+        }
+        resp = await client.post(f"/session/{session_id}/prompt_async", json=payload)
+        resp.raise_for_status()
+
+    async def abort_session(self, session_id: str) -> bool:
+        client = await self._get_client()
+        resp = await client.post(f"/session/{session_id}/abort")
+        resp.raise_for_status()
+        return resp.json()
+
+    async def get_session_status(self) -> dict[str, Any]:
+        client = await self._get_client()
+        resp = await client.get("/session/status")
+        resp.raise_for_status()
+        return resp.json()
+
+
+opencode_client = OpenCodeClient()