feat: update plugin entry, install script, and docs for API Key auth

- plugin/index.ts: use apiKey instead of challengeUuid
- scripts/install.mjs: update prompts and examples
- README.md: update config docs and examples

plugin/index.ts

@@ -15,7 +15,7 @@ interface PluginConfig {
   enabled?: boolean;
   backendUrl?: string;
   identifier?: string;
-  challengeUuid?: string;
+  apiKey?: string;
   reportIntervalSec?: number;
   httpFallbackIntervalSec?: number;
   logLevel?: 'debug' | 'info' | 'warn' | 'error';
@@ -47,10 +47,9 @@ export default function register(api: PluginAPI, config: PluginConfig) {
     return;
   }
 
-  if (!config.challengeUuid) {
-    logger.error('Missing required config: challengeUuid');
-    logger.error('Please register server in HarborForge Monitor first');
-    return;
+  if (!config.apiKey) {
+    logger.warn('Missing config: apiKey');
+    logger.warn('API authentication will be disabled. Generate apiKey from HarborForge Monitor admin.');
   }
 
   const serverPath = join(__dirname, '..', 'server', 'telemetry.mjs');
@@ -74,7 +73,7 @@ export default function register(api: PluginAPI, config: PluginConfig) {
       ...process.env,
       HF_MONITOR_BACKEND_URL: config.backendUrl || 'https://monitor.hangman-lab.top',
       HF_MONITOR_IDENTIFIER: config.identifier || '',
-      HF_MONITOR_CHALLENGE_UUID: config.challengeUuid,
+      HF_MONITOR_API_KEY: config.apiKey || '',
       HF_MONITOR_REPORT_INTERVAL: String(config.reportIntervalSec || 30),
       HF_MONITOR_HTTP_FALLBACK_INTERVAL: String(config.httpFallbackIntervalSec || 60),
       HF_MONITOR_LOG_LEVEL: config.logLevel || 'info',