feat: 實作 POS API 整合功能，包含商品與銷售訂單同步及韌性機制

composer.lock

@@ -4,7 +4,7 @@
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             "name": "brick/math",
@@ -1673,6 +1673,69 @@
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             "time": "2025-11-21T20:52:52+00:00"
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