fix: add missing client.ts file for courtlistener-sdk to fix CI builds

- Add axios client configuration matching other SDKs pattern
- Implement customInstance function required by Orval mutator
- Include CourtListener API authentication token support
- Fixes SDK generation failure in GitHub Actions workflows

Author: beshkenadze

packages/courtlistener-sdk/src/api/client.ts

@@ -0,0 +1,31 @@
+import axios, { type AxiosRequestConfig } from 'axios';
+
+export const customInstance = <T>(
+  config: AxiosRequestConfig,
+  options?: AxiosRequestConfig,
+): Promise<T> => {
+  // Get auth token if available
+  const authToken = process.env.COURTLISTENER_API_TOKEN;
+  
+  const source = axios.CancelToken.source();
+  const promise = axios({
+    baseURL: 'https://www.courtlistener.com',
+    timeout: 30000,
+    headers: {
+      'Content-Type': 'application/json',
+      ...(authToken && { 'Authorization': `Token ${authToken}` }),
+    },
+    ...config,
+    ...options,
+    cancelToken: source.token,
+  }).then(({ data }) => data);
+
+  // @ts-ignore
+  promise.cancel = () => {
+    source.cancel('Query was cancelled by React Query');
+  };
+
+  return promise;
+};
+
+export default customInstance;