refactor: slim down EngineManager from 861 to 290 lines by removing passthrough proxy pattern

- EngineManager now only exposes public SDK API (initialize, loadModel, pause/resumeRendering, getEngineComponent, destroy)
- Internal managers access Engine component directly via this.engineComponent getter on BaseManager
- Non-manager components use registry.engine3d.getEngineComponent() for direct Engine access
- Replaced getEngine() with onRawEvent()/offRawEvent() for raw engine event access
- Migrated 62 call sites across 13 files (9 managers, 1 panel, 3 toolbar buttons)
- Updated all architecture docs, API docs, and README to reflect new patterns

src/locales/en-US.ts

@@ -227,27 +227,13 @@ export const enUS: TranslationDictionary = {
             advanced: 'Quality',
         },
         edgeLine: 'Edge Lines',
-        ground: 'Ground',
-        groundSize: 'Size',
-        groundTypes: {
-            none: 'None',
-            concrete: 'Concrete',
-            grass: 'Grass',
-            tile: 'Tile',
-            water: 'Water',
-            wood: 'Wood',
-        },
         contrast: 'Contrast',
         saturation: 'Saturation',
         lightIntensity: 'Light Intensity',
         environment: 'Environment',
-        environments: {
-            default: 'Default',
-            outdoor: 'Outdoor',
-            indoor: 'Indoor',
-            night: 'Night',
-            overcast: 'Overcast',
-            studio: 'Studio',
-        },
+        backgroundVisible: 'Show Background',
+        ground: 'Ground',
+        groundElevation: 'Ground Elevation',
+        groundElevationUnit: 'm',
     }
 };

src/locales/types.ts

@@ -250,17 +250,6 @@ export interface TranslationDictionary {
         };
         /** 边线 */
         edgeLine: string;
-        /** 显示地面 */
-        ground: string;
-        groundSize: string;
-        groundTypes: {
-            none: string;
-            concrete: string;
-            grass: string;
-            tile: string;
-            water: string;
-            wood: string;
-        };
         /** 对比度 */
         contrast: string;
         /** 饱和度 */
@@ -269,14 +258,14 @@ export interface TranslationDictionary {
         lightIntensity: string;
         /** 环境背景 */
         environment: string;
-        environments: {
-            default: string;
-            outdoor: string;
-            indoor: string;
-            night: string;
-            overcast: string;
-            studio: string;
-        };
+        /** 显示背景 */
+        backgroundVisible: string;
+        /** 显示地面 */
+        ground: string;
+        /** 地面高度 */
+        groundElevation: string;
+        /** 地面高度单位 */
+        groundElevationUnit: string;
     };
 }
 

src/locales/zh-CN.ts

@@ -227,27 +227,13 @@ export const zhCN: TranslationDictionary = {
             advanced: '效果模式',
         },
         edgeLine: '边线',
-        ground: '显示地面',
-        groundSize: '大小',
-        groundTypes: {
-            none: '无',
-            concrete: '混凝土',
-            grass: '草地',
-            tile: '瓷砖',
-            water: '水面',
-            wood: '木地板',
-        },
         contrast: '对比度',
         saturation: '饱和度',
         lightIntensity: '光照强度',
         environment: '环境背景',
-        environments: {
-            default: '默认',
-            outdoor: '室外',
-            indoor: '室内',
-            night: '夜晚',
-            overcast: '阴天',
-            studio: '工作室',
-        },
+        backgroundVisible: '显示背景',
+        ground: '显示地面',
+        groundElevation: '地面高度',
+        groundElevationUnit: 'm',
     }
 };