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/entry/build/default/intermediates/loader/default/loader.json

@@ -0,0 +1,26 @@
+{
+  "modulePathMap": {
+    "entry": "/home/program/TrulyMEM-TrueHumanMEM/harmonyos/entry",
+    "trulymem-core": "/home/program/TrulyMEM-TrueHumanMEM/harmonyos/trulymem-core"
+  },
+  "compileMode": "esmodule",
+  "projectRootPath": "/home/program/TrulyMEM-TrueHumanMEM/harmonyos",
+  "nodeModulesPath": "/home/program/TrulyMEM-TrueHumanMEM/harmonyos/entry/build/default/intermediates/loader_out/default/node_modules",
+  "byteCodeHarInfo": {},
+  "declarationEntry": [],
+  "moduleName": "entry",
+  "hspNameOhmMap": {},
+  "harNameOhmMap": {},
+  "packageManagerType": "ohpm",
+  "compileEntry": [
+    "/home/program/TrulyMEM-TrueHumanMEM/harmonyos/entry/build/default/generated/r/default/ResourceTable.ts"
+  ],
+  "otherCompileFiles": [],
+  "dynamicImportLibInfo": {},
+  "routerMap": [],
+  "hspResourcesMap": {},
+  "updateVersionInfo": {},
+  "customizedHar": false,
+  "anBuildOutPut": "/home/program/TrulyMEM-TrueHumanMEM/harmonyos/entry/build/default/intermediates/loader_out/default/an/arm64-v8a",
+  "anBuildMode": "type"
+}

harmonyos/entry/build/default/intermediates/loader/default/pkgContextInfo.json

@@ -0,0 +1 @@
+{"entry":{"packageName":"entry","bundleName":"","moduleName":"","version":"","entryPath":"src/main/","isSO":false,"dependencyAlias":""}}