feat: 取消签退(clock_out)机制，仅保留签到记录

GPS定位偏差导致设备频繁误判为离开围栏触发签退，
移除所有签退逻辑：围栏出栏不再创建clock_out，
设备考勤(0xB0/0xB1)和蓝牙打卡(0xB2)统一只记录签到。

via [HAPI](https://hapi.run)

Co-Authored-By: HAPI <noreply@hapi.run>

app/services/fence_checker.py

@@ -290,39 +290,11 @@ async def check_device_fences(
                 )
 
         elif not currently_inside and was_inside:
-            # EXIT: inside -> outside = clock_out
-            if state and state.last_transition_at:
-                elapsed = (now - state.last_transition_at).total_seconds()
-                if elapsed < min_interval:
-                    logger.debug(
-                        "Fence %d debounce: %ds < %ds, skip clock_out for device %d",
-                        fence.id, int(elapsed), min_interval, device_id,
-                    )
-                    _update_state(state, currently_inside, now, latitude, longitude)
-                    continue
-
-            # Daily dedup: only one clock_out per device per day
-            if await _has_attendance_today(session, device_id, "clock_out"):
-                logger.info(
-                    "Fence skip clock_out: device=%d fence=%d(%s) already clocked out today",
-                    device_id, fence.id, fence.name,
-                )
-            else:
-                attendance = _create_attendance(
-                    device_id, imei, "clock_out", latitude, longitude,
-                    address, recorded_at, fence, device_info,
-                )
-                session.add(attendance)
-
-                event = _build_event(
-                    device_id, imei, fence, "clock_out",
-                    latitude, longitude, address, recorded_at,
-                )
-                events.append(event)
-                logger.info(
-                    "Fence auto clock_out: device=%d fence=%d(%s)",
-                    device_id, fence.id, fence.name,
-                )
+            # EXIT: inside -> outside — skip clock_out (GPS drift causes false exits)
+            logger.debug(
+                "Fence exit ignored: device=%d fence=%d(%s), no clock_out created",
+                device_id, fence.id, fence.name,
+            )
 
         # 4. Update state
         if state is None: