feat: Implement temporary API key based on system UUID for UI access

This commit introduces a new authentication mechanism for the web UI.
Instead of requiring a pre-configured API key, a temporary API key is
generated based on the system's UUID. This key is passed to the UI
as a URL parameter and used for API requests.

Changes:
- Added a new utility to get the system UUID and generate a temporary API key.
- Modified the `ccr ui` command to generate and pass the temporary API key.
- Updated the authentication middleware to validate the temporary API key.
- Adjusted the frontend to use the temporary API key from the URL.
- Added a dedicated endpoint to test API access without modifying data.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/utils/index.ts

@@ -8,6 +8,7 @@ import {
   HOME_DIR,
   PLUGINS_DIR,
 } from "../constants";
+import { getSystemUUID, generateTempAPIKey, getTempAPIKey } from "./systemUUID";
 
 const ensureDir = async (dir_path: string) => {
   try {
@@ -135,3 +136,6 @@ export const initConfig = async () => {
   Object.assign(process.env, config);
   return config;
 };
+
+// 导出系统UUID相关函数
+export { getSystemUUID, generateTempAPIKey, getTempAPIKey };