完善合同气瓶绑定约束与候选过滤

- 明确合同状态、气瓶归属、停用、报废和重复绑定失败原因
- 根据当前合同过滤可绑定气瓶，排除无效及重复候选项
- 从合同列表进入绑定页时锁定预填合同，防止切换上下文
- 切换通用新建页合同后清空旧气瓶并重新加载候选项
- 增加前后端回归检查并同步中文操作日志

frontend/platform_admin/package.json

@@ -18,6 +18,7 @@
     "avatar-retry:check": "node scripts/check-avatar-upload-cache.mjs",
     "contract-attachment:check": "node scripts/check-contract-attachment-control.mjs",
     "contract-product-entry:check": "node scripts/check-contract-product-entry.mjs",
+    "contract-product-filter:check": "node scripts/check-contract-product-filter.mjs",
     "staff-organization:check": "node scripts/check-staff-organization-linkage.mjs",
     "staff-relations:check": "node scripts/check-staff-relation-policy.mjs",
     "user-address-display:check": "node scripts/check-user-address-relation-display.mjs",