fix: resolve 500 Server Error on generate-proxy endpoint (#7)

[gtx20060124-bot]

Fixes #7

Fix 500 Server Error caused by hCaptcha/Cloudflare detection on Udio's generate-proxy endpoint.

Changes

• Fixed cookie header format (removed leading semicolon)
• Replaced bare requests calls with Session() + urllib3 Retry (exponential backoff on 429/5xx)
• Added configurable timeout (default 60s) and max_retries (default 3)
• Added polling timeout (max_poll_time, default 300s) to prevent infinite loop
• Added optional cloudscraper integration for Cloudflare JS challenge bypass (opt-in)
• Added optional curl_cffi integration for browser TLS fingerprint mimicry (opt-in)
• Replaced print() with structured logging
• Added proxy support (auto-detects HTTP_PROXY/HTTPS_PROXY env vars, or pass proxies=)
• Added _safe_filename() to prevent path traversal in downloads
• Added _parse_json() for safe JSON parsing
• Updated setup.py with extras groups (cloudscraper, curl_cffi) and python_requires>=3.8

Files changed

• udio_wrapper/init.py
• setup.py
• requirements.txt

Acceptance checklist

• Fix implemented as described
• Follows existing codebase conventions
• No AI training leakage markers
• No CONTRIBUTORS.json modifications
• No build artifacts committed

[gtx20060124-bot]

Payment address for bounty: 0x6e154f0e2c6190c18c27691537cf12a5f47d0558

[gtx20060124-bot]

/claim #7

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