feat: 合并星图和聊天页面为 MainPage，响应式 GridRow 布局

- 新建 MainPage.ets，用 GridRow 响应式布局组合星图+聊天
- Index.ets 改为 2 Tab（TrulyMEM + 设置）
- GraphPage/ChatPage 接收 @Prop db 从父组件传入
- 恢复 README.md / README_EN.md 的特别鸣谢部分

harmonyos/hvigor/hvigor-config.json5

@@ -1,5 +1,23 @@
 {
   "modelVersion": "5.0.5",
-  "dependencies": {},
-  "execution": {}
+  "dependencies": {
+  },
+  "execution": {
+    // "analyze": "normal",                     /* Define the build analyze mode. Value: [ "normal" | "advanced" | "ultrafine" | false ]. Default: "normal" */
+    // "daemon": true,                          /* Enable daemon compilation. Value: [ true | false ]. Default: true */
+    // "incremental": true,                     /* Enable incremental compilation. Value: [ true | false ]. Default: true */
+    // "parallel": true,                        /* Enable parallel compilation. Value: [ true | false ]. Default: true */
+    // "typeCheck": false,                      /* Enable typeCheck. Value: [ true | false ]. Default: false */
+    // "optimizationStrategy": "memory"         /* Define the optimization strategy. Value: [ "memory" | "performance" ]. Default: "memory" */
+  },
+  "logging": {
+    // "level": "info"                          /* Define the log level. Value: [ "debug" | "info" | "warn" | "error" ]. Default: "info" */
+  },
+  "debugging": {
+    // "stacktrace": false                      /* Disable stacktrace compilation. Value: [ true | false ]. Default: false */
+  },
+  "nodeOptions": {
+    // "maxOldSpaceSize": 8192                  /* Enable nodeOptions maxOldSpaceSize compilation. Unit M. Used for the daemon process. Default: 8192*/
+    // "exposeGC": true                         /* Enable to trigger garbage collection explicitly. Default: true*/
+  }
 }