feat: route admin chat through Hermes Agent API (DeepSeek fallback)

src/modules/admin-ai-chat/admin-ai-chat.service.ts

@@ -2,6 +2,10 @@
 import { DeepSeekProvider } from '../ai/providers/deepseek.provider';
 import type { AiChatDto } from './dto/ai-chat.dto';
 
+const HERMES_API_URL = 'http://10.2.0.7:8642/v1/chat/completions';
+const HERMES_API_KEY = 'zhixi-hermes-key-2026';
+const SYSTEM_PROMPT = '你是知习管理后台的 AI 任务助理，帮助管理员处理日常任务、解答问题。请用简洁专业的中文回复。';
+
 @Injectable()
 export class AdminAiChatService {
   private readonly logger = new Logger(AdminAiChatService.name);
@@ -14,11 +18,48 @@ export class AdminAiChatService {
 
     const messages = hasSystemPrompt
       ? dto.messages
-      : [
-          { role: 'system' as const, content: '你是知习管理后台的 AI 任务助理，帮助管理员处理日常任务、解答问题。请用简洁专业的中文回复。' },
-          ...dto.messages,
-        ];
+      : [{ role: 'system' as const, content: SYSTEM_PROMPT }, ...dto.messages];
 
+    // Try Hermes Agent first, fall back to DeepSeek
+    try {
+      return await this.callHermes(messages);
+    } catch (err: any) {
+      this.logger.warn('Hermes unavailable, falling back to DeepSeek: ' + err.message);
+      return await this.callDeepSeek(messages);
+    }
+  }
+
+  private async callHermes(messages: Array<{ role: string; content: string }>) {
+    const start = Date.now();
+    const resp = await fetch(HERMES_API_URL, {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+        Authorization: 'Bearer ' + HERMES_API_KEY,
+      },
+      body: JSON.stringify({
+        model: 'hermes-agent',
+        messages,
+        temperature: 0.7,
+        max_tokens: 4096,
+      }),
+      signal: AbortSignal.timeout(120_000),
+    });
+
+    if (!resp.ok) {
+      throw new Error('Hermes returned ' + resp.status);
+    }
+
+    const data = await resp.json();
+    const content = data.choices?.[0]?.message?.content || '';
+    const usage = data.usage || {};
+
+    this.logger.log('Hermes chat: ' + (Date.now() - start) + 'ms, tokens: ' +
+      (usage.prompt_tokens || 0) + '/' + (usage.completion_tokens || 0));
+    return { content, usage: { model: 'hermes-agent', inputTokens: usage.prompt_tokens, outputTokens: usage.completion_tokens } };
+  }
+
+  private async callDeepSeek(messages: Array<{ role: string; content: string }>) {
     const start = Date.now();
     const result = await this.deepseek.generate({
       model: 'deepseek-chat',
@@ -26,20 +67,15 @@ export class AdminAiChatService {
       temperature: 0.7,
       maxTokens: 4096,
     });
-
-    this.logger.log(`AI chat completed in ${Date.now() - start}ms, tokens: ${result.usage?.inputTokens ?? 0}/${result.usage?.outputTokens ?? 0}`);
-
-    return {
-      content: result.rawText,
-      usage: result.usage,
-    };
+    this.logger.log('DeepSeek chat: ' + (Date.now() - start) + 'ms');
+    return { content: result.rawText, usage: result.usage };
   }
 
   getDashboardConfig() {
     return {
       url: 'http://10.2.0.7:9119',
-      token: 'v8dAkvcsHaHe_yok5kjO0QErKtogQcq3IKaJT8PNczQ',
-      description: 'Hermes Agent Dashboard — 4核4G 上的 AI Agent，可执行服务器管理、文件操作等高级任务',
+      apiUrl: 'http://10.2.0.7:8642/v1',
+      description: 'Hermes Agent Dashboard — 4核4G 上的 AI Agent',
     };
   }
 }