refactor: 重命名SDK为iflow-engine，使用npm包引入第三方引擎

- 将包名从 @fishdingding/bim-engine-sdk 改为 iflow-engine
- 将构建输出文件从 bim-engine-sdk.*.js 改为 iflow-engine.*.js
- 将全局变量从 LyzBimEngineSDK 改为 IflowEngine
- 将第三方引擎SDK从本地引入改为npm包引入 (iflow-engine-base)
- 移除本地 src/engine_base 目录，移至回收站
- 更新所有文档和demo中的引用

src/components/dialog/index.css

@@ -1,8 +1,8 @@
 .bim-dialog {
     position: absolute;
-    background-color: var(--bim-dialog-bg, var(--bim-bg-elevated));
-    border: 1px solid var(--bim-dialog-border-color, var(--bim-border-default));
-    border-radius: 6px;
+    background-color: var(--bim-bg-elevated);
+    border: 1px solid var(--bim-border-default);
+    border-radius: var(--bim-panel-radius, 12px);
     box-shadow: var(--bim-shadow-lg);
     display: flex;
     flex-direction: column;
@@ -15,15 +15,15 @@
 }
 
 .bim-dialog-header {
-    height: 32px;
-    background-color: var(--bim-dialog-header-bg, var(--bim-bg-inset));
+    height: 40px;
+    background-color: var(--bim-bg-inset);
     display: flex;
     align-items: center;
     justify-content: space-between;
-    padding: 0 10px;
+    padding: 0 12px;
     cursor: default;
     user-select: none;
-    border-bottom: 1px solid var(--bim-dialog-border-color, var(--bim-border-default));
+    border-bottom: 1px solid var(--bim-border-default);
     flex-shrink: 0;
 }