fix: 补提交缺失的 Blur 组件，修复 CI 打包找不到模块，版本号 1.1.2

AssetsModule 等引用 src/components/Blur 但该文件未纳入版本库导致 CI
rollup 报 Could not resolve "../../components/Blur"。

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/components/Blur.tsx

@@ -0,0 +1,17 @@
+import { createContext, useContext, type ReactNode } from 'react';
+
+const DemoModeContext = createContext(false);
+
+export function DemoModeProvider({ enabled, children }: { enabled: boolean; children: ReactNode }) {
+  return <DemoModeContext.Provider value={enabled}>{children}</DemoModeContext.Provider>;
+}
+
+export function useDemoMode() {
+  return useContext(DemoModeContext);
+}
+
+export default function Blur({ children }: { children: ReactNode }) {
+  const demo = useContext(DemoModeContext);
+  if (!demo) return <>{children}</>;
+  return <span className="blur-[5px] select-none">{children}</span>;
+}