feat: migrate Kimi from Moonshot to Artemox OpenAI API

- Add claude-openai-anthropic-proxy.py (Anthropic ↔ OpenAI translator)
- Rewrite claude_kimi to use native kimi CLI instead of Claude wrapper
- Add OpenAI-compatible API test helpers (_claude_test_openai_api, _handle_openai_api_response)
- Replace 127.0.0.1 with localhost for broader compatibility
- Add test for query-string handling in Kimi proxy
- Update README to reflect Artemox API usage

test_sigint.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+python3 -c "import time; print('python started'); time.sleep(100)" &
+py_pid=$!
+node -e "
+  console.log('node started');
+  process.on('SIGINT', () => console.log('node caught sigint'));
+  setTimeout(() => console.log('node done'), 10000);
+"
+echo "checking python"
+kill -0 $py_pid 2>/dev/null && echo "python alive" || echo "python dead"