feat: 物料编号可编辑 + 工作台行内编辑/搜索 + 编号冲突合并/删除

- 物料编辑页物料编号放开可编辑并校验唯一性
- 工厂工作台看板行内可编辑型号/单位/安全库存/物料编号
- 工作台新增物料编号/型号搜索过滤
- 编号冲突时支持合并到已存在物料(保留流水)或删除整条物料(删前备份)

static/style.css

@@ -44,12 +44,17 @@ label { display: block; margin: 10px 0 4px; font-size: 13px; color: #44525f; }
 input, select, textarea {
   width: 100%; padding: 8px 10px; border: 1px solid #cdd5df; border-radius: 6px; font-size: 14px;
 }
+.cell-inp { width: 100%; box-sizing: border-box; padding: 4px 6px; border: 1px solid #c9d2dc; border-radius: 4px; font-size: 13px; }
+.cell-inp.num { text-align: right; }
+.readonly-field { width: 100%; box-sizing: border-box; padding: 8px 10px; border: 1px solid #dfe3e8; border-radius: 6px; background: #f1f3f6; color: #6b7280; font-size: 14px; }
+.btn.small, button.small { padding: 5px 10px; font-size: 12px; border-radius: 5px; }
 button, .btn {
   display: inline-block; cursor: pointer; border: none; border-radius: 6px;
   padding: 9px 16px; font-size: 14px; text-decoration: none; background: #eef1f5; color: #1f2733;
 }
 button.primary, .btn.primary { background: #1f3a5f; color: #fff; }
 button.secondary, .btn.secondary { background: #2f7d5b; color: #fff; }
+button.danger, .btn.danger { background: #e6453c; color: #fff; border-color: #d23b32; }
 button:hover, .btn:hover { filter: brightness(.96); }
 .link-danger { background: none; border: none; color: #c0392b; cursor: pointer; padding: 0 4px; font-size: 14px; }
 .link-danger:hover { text-decoration: underline; }