Add static quota display for Qwen OAuth provider (portal.qwen.ai).
Qwen OAuth API does not return rate-limit headers, so this provides
a static quota indicator based on known OAuth free-tier limits.
Changes:
- Add QwenQuotaExtractor in quota_adapter.rs
- Parses rate-limit errors for retry backoff
- Registered for all Qwen aliases (qwen, qwen-code, dashscope, etc.)
- Add Qwen OAuth detection in quota_cli.rs
- Auto-detects ~/.qwen/oauth_creds.json
- Displays static quota: ?/1000 (unknown remaining, 1000/day total)
- Improve quota display formatting
- Shows "?/total" when only total limit is known
- Add comprehensive test report and testing scripts
- Full integration test report: docs/qwen-provider-test-report.md
- Model availability, context window, and latency tests
- Reusable test scripts in scripts/ directory
Test results:
- Available model: qwen3-coder-plus (verified)
- Context window: ~32K tokens
- Average latency: ~2.8s
- All 15 quota tests passing
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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