feat(material): add global floating helper to track latest specification codes with smart grouping

inventory-backend/app/api/v1/inbound/base.py

@@ -455,3 +455,21 @@ def batch_set_inspection():
         db.session.rollback()
         current_app.logger.error(f"批量设置强制质检失败: {str(e)}")
         return jsonify({"code": 500, "msg": f"批量设置强制质检失败: {str(e)}"}), 500
+
+
+# ==============================================================================
+# 2.7 智能分组求最大连号 API (GET /api/v1/inbound/base/spec-latest)
+# ==============================================================================
+@inbound_base_bp.route('/spec-latest', methods=['GET'])
+@permission_required('material_list')
+def get_spec_latest():
+    """
+    获取所有规格型号的最大连号，按智能分组返回
+    返回格式: [{"group": "S", "latest": "S0115/S0115"}, {"group": "Opt4xxx", "latest": "Opt4018/Opt4018"}, ...]
+    """
+    try:
+        data = MaterialBaseService.get_latest_specs()
+        return jsonify({"code": 200, "msg": "success", "data": data})
+    except Exception as e:
+        traceback.print_exc()
+        return jsonify({"code": 500, "msg": str(e)}), 500