feat(追踪系统): 修改钢卷追踪逻辑为按钢卷号升序处理

- 前端调整位置数量从5个改为4个并更新提示信息
- 后端修改SQL查询按COILID升序获取钢卷
- 新增按钢卷号范围查询功能
- 实现追踪状态管理，支持追踪结束检测和恢复
- 优化信号处理逻辑，支持末卷重复信号处理

backend/sqlite_sync.py

@@ -337,7 +337,7 @@ def sqlite_get_coils_by_sequencenb_range(start_seq: int, end_seq: int) -> List[D
             SELECT COILID, SEQUENCENB, ROLLPROGRAMNB
             FROM PDI_PLTM
             WHERE SEQUENCENB >= ? AND SEQUENCENB <= ?
-            ORDER BY SEQUENCENB DESC
+            ORDER BY COILID ASC
         """, (start_seq, end_seq))
         rows = cursor.fetchall()
         return [{"coilid": r[0], "sequencenb": r[1], "rollprogramnb": r[2]} for r in rows]
@@ -345,12 +345,42 @@ def sqlite_get_coils_by_sequencenb_range(start_seq: int, end_seq: int) -> List[D
         sc.close()
 
 
+def sqlite_get_coils_by_coilid(start_coilid: str, count: int = 4) -> List[Dict[str, Any]]:
+    sc = get_sqlite()
+    try:
+        cursor = sc.execute("""
+            SELECT COILID, SEQUENCENB, ROLLPROGRAMNB
+            FROM PDI_PLTM
+            WHERE COILID >= ?
+            ORDER BY COILID ASC
+            LIMIT ?
+        """, (start_coilid, count))
+        rows = cursor.fetchall()
+        return [{"coilid": r[0], "sequencenb": r[1], "rollprogramnb": r[2]} for r in rows]
+    finally:
+        sc.close()
+
+
+def sqlite_get_first_coils(count: int = 4) -> List[Dict[str, Any]]:
+    sc = get_sqlite()
+    try:
+        cursor = sc.execute("""
+            SELECT COILID, SEQUENCENB, ROLLPROGRAMNB
+            FROM PDI_PLTM
+            ORDER BY COILID ASC
+            LIMIT ?
+        """, (count,))
+        rows = cursor.fetchall()
+        return [{"coilid": r[0], "sequencenb": r[1], "rollprogramnb": r[2]} for r in rows]
+    finally:
+        sc.close()
+
+
 def sqlite_save_coils_to_track(coils: List[Dict[str, Any]]):
     sc = get_sqlite()
     try:
         sc.execute("DELETE FROM COIL_TRACK_TEMP")
-        reversed_coils = list(reversed(coils))
-        for i, coil in enumerate(reversed_coils):
+        for i, coil in enumerate(coils):
             sc.execute("""
                 INSERT INTO COIL_TRACK_TEMP (COILID, SEQUENCENB, ROLLPROGRAMNB, POSITION)
                 VALUES (?, ?, ?, ?)