feat(uikit): 新增通用 UI 组件库与主题 token

uikit/src/main/ets/Index.ets

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+export { AppColor, AppSpacing, AppFontSize } from './theme/Theme';
+export { AppButton, ButtonVariant } from './components/AppButton';
+export { LoadingView } from './components/LoadingView';
+export { EmptyView } from './components/EmptyView';

uikit/src/main/ets/components/AppButton.ets

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+import { AppColor } from '../theme/Theme';
+
+export enum ButtonVariant {
+  Primary = 'primary',
+  Secondary = 'secondary'
+}
+
+/**
+ * 通用按钮：@ComponentV2 + @Param 输入 + @Event 输出回调。
+ */
+@ComponentV2
+export struct AppButton {
+  @Param text: string = '';
+  @Param variant: ButtonVariant = ButtonVariant.Primary;
+  @Param disabled: boolean = false;
+  @Event onTap: () => void;
+
+  build() {
+    Button(this.text)
+      .width('100%')
+      .height(48)
+      .fontSize(16)
+      .fontColor(this.variant === ButtonVariant.Primary ? AppColor.white : AppColor.primary)
+      .backgroundColor(this.variant === ButtonVariant.Primary ? AppColor.primary : AppColor.white)
+      .borderRadius(8)
+      .enabled(!this.disabled)
+      .onClick(() => {
+        if (!this.disabled) {
+          this.onTap();
+        }
+      })
+  }
+}

uikit/src/main/ets/components/EmptyView.ets

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+import { AppColor, AppFontSize } from '../theme/Theme';
+
+/**
+ * 通用空态组件。
+ */
+@ComponentV2
+export struct EmptyView {
+  @Param text: string = '暂无数据';
+
+  build() {
+    Column({ space: 8 }) {
+      Text('暂无内容')
+        .fontSize(AppFontSize.headline)
+        .fontColor(AppColor.textSecondary)
+      Text(this.text)
+        .fontSize(AppFontSize.body)
+        .fontColor(AppColor.textSecondary)
+    }
+  }
+}

uikit/src/main/ets/components/LoadingView.ets

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+import { AppColor, AppFontSize } from '../theme/Theme';
+
+/**
+ * 通用加载态组件。
+ */
+@ComponentV2
+export struct LoadingView {
+  @Param text: string = '加载中...';
+
+  build() {
+    Column({ space: 8 }) {
+      LoadingProgress()
+        .width(32)
+        .height(32)
+        .color(AppColor.primary)
+      Text(this.text)
+        .fontSize(AppFontSize.body)
+        .fontColor(AppColor.textSecondary)
+    }
+  }
+}

uikit/src/main/ets/theme/Theme.ets

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+/**
+ * 主题 token：颜色 / 间距 / 字号。
+ * 全 App 统一从这里取值，避免散落魔法值。
+ */
+export class AppColor {
+  static readonly primary: string = '#0A59F7';
+  static readonly primaryPressed: string = '#094CCB';
+  static readonly textPrimary: string = '#182431';
+  static readonly textSecondary: string = '#66182431';
+  static readonly background: string = '#F1F3F5';
+  static readonly white: string = '#FFFFFF';
+  static readonly divider: string = '#0D182431';
+  static readonly danger: string = '#E84026';
+}
+
+export class AppSpacing {
+  static readonly xs: number = 4;
+  static readonly sm: number = 8;
+  static readonly md: number = 16;
+  static readonly lg: number = 24;
+  static readonly xl: number = 32;
+}
+
+export class AppFontSize {
+  static readonly caption: number = 12;
+  static readonly body: number = 14;
+  static readonly title: number = 16;
+  static readonly headline: number = 20;
+}

uikit/src/main/module.json5

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+{
+  "module": {
+    "name": "uikit",
+    "type": "har",
+    "description": "$string:module_desc",
+    "deviceTypes": [
+      "phone"
+    ]
+  }
+}

uikit/src/main/resources/base/element/string.json

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+{
+  "string": [
+    {
+      "name": "module_desc",
+      "value": "uikit module"
+    }
+  ]
+}