feat(api): add AgentClient class for listing agents

Implement a new API client class to handle agent listing operations with proper error handling and validation

src/renderer/src/api/agent.ts

@@ -0,0 +1,34 @@
+import { ListAgentsResponseSchema, type ListAgentsResponse } from '@types'
+import { Axios, AxiosRequestConfig } from 'axios'
+
+type ApiVersion = 'v1'
+
+// const logger = loggerService.withContext('AgentClient')
+
+export class AgentClient {
+  private axios: Axios
+  private apiVersion: ApiVersion = 'v1'
+  constructor(config: AxiosRequestConfig, apiVersion?: ApiVersion) {
+    if (!config.baseURL || !config.headers?.Authorization) {
+      throw new Error('Please pass in baseUrl and Authroization header.')
+    }
+    this.axios = new Axios(config)
+    if (apiVersion) {
+      this.apiVersion = apiVersion
+    }
+  }
+
+  public async listAgents(): Promise<ListAgentsResponse> {
+    const url = `/${this.apiVersion}/agents`
+    try {
+      const response = await this.axios.get(url)
+      const result = ListAgentsResponseSchema.safeParse(response.data)
+      if (!result.success) {
+        throw new Error('Not a valid Agents array.')
+      }
+      return result.data
+    } catch (error) {
+      throw new Error('Failed to list agents.', { cause: error })
+    }
+  }
+}