feat: v0.9.0 新增记录日志、设备更换记录及IMC服务集成

- 新增 RecordsLog.vue 操作记录日志页面
- 新增 ReplacementRecords.vue 设备更换记录页面
- 新增 imc_service.py IMC网管系统集成服务
- 新增 datetime.js 前端日期时间工具函数
- 新增 OLT时间同步.md 文档
- 扩展 devices.py API：设备更换记录、批量操作等
- 扩展 ssh_service.py：OLT时间同步功能
- 扩展 olt.py：新增时间同步相关接口
- 更新 DeviceList.vue：增强设备列表功能
- 更新路由和导航菜单
- 将 .claude/ 和 .mcp.json 加入 .gitignore

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/api/v1/olt.py

@@ -500,6 +500,64 @@ def loopback_detection(
     return [results_map[olt.id] for olt in olts]
 
 
+class SyncNTPRequest(BaseModel):
+    old_server: str = "172.16.0.254"
+    new_server: str = "172.16.1.252"
+
+
+@router.post("/sync-ntp")
+def sync_ntp(
+    body: SyncNTPRequest,
+    db: Session = Depends(get_db),
+    current: dict = Depends(require_permission('olt.manage')),
+):
+    """对所有 OLT 并发执行 NTP 时间服务器同步"""
+    from app.services.ssh_service import SSHService
+    from concurrent.futures import ThreadPoolExecutor, as_completed
+
+    olts = db.query(OLTDevice).all()
+    if current.get('role') == 'area_admin' and current.get('assigned_area'):
+        areas = [a.strip() for a in current['assigned_area'].split(',') if a.strip()]
+        olts = [o for o in olts if o.region in areas] if areas else []
+
+    def sync_one(olt):
+        ssh = SSHService(olt.ip_address, olt.username, olt.password)
+        try:
+            ssh.connect()
+            ssh.sync_ntp(body.old_server, body.new_server)
+            return {
+                "olt_ip": olt.ip_address,
+                "olt_location": olt.location or olt.ip_address,
+                "success": True,
+                "error": None,
+            }
+        except Exception as e:
+            return {
+                "olt_ip": olt.ip_address,
+                "olt_location": olt.location or olt.ip_address,
+                "success": False,
+                "error": str(e),
+            }
+        finally:
+            ssh.close()
+
+    results_map = {}
+    with ThreadPoolExecutor(max_workers=len(olts) or 1) as executor:
+        futures = {executor.submit(sync_one, olt): olt.id for olt in olts}
+        for future in as_completed(futures):
+            r = future.result()
+            results_map[r["olt_ip"]] = r
+
+    results = [results_map[olt.ip_address] for olt in olts]
+    success_count = sum(1 for r in results if r["success"])
+    return {
+        "total": len(results),
+        "success": success_count,
+        "failed": len(results) - success_count,
+        "results": results,
+    }
+
+
 class TogglePortRequest(BaseModel):
     action: str  # "shutdown" 或 "undo shutdown"