fix: auto-solve hCaptcha on 500 Server Error (fixes #7)

[bethoslabs]

Fix for #7 - 500 Error / hCaptcha Auto-Solve

Added hcaptcha_solver.py with auto-detect + Capsolver/2captcha/manual fallback.
make_request() now retries with solved CAPTCHA token on 500 errors.

Key improvements over existing PR #32:

• Dynamic site key extraction - no hardcoded placeholder keys
• 2captcha fallback support in addition to Capsolver
• 5-minute token caching to avoid re-solving on every request
• Clean implementation without dead code or binary files

Changes

• New hcaptcha_solver.py module with detect_hcaptcha(), solve_hcaptcha(), and ensure_token()
• make_request() retries with fresh captcha token on 500/403/429 errors
• Token caching with 5-minute TTL
• Set CAPSOLVER_API_KEY or CAPTCHA_API_KEY env var for auto-solve

Usage

from udio_wrapper import UdioWrapper

# Set env var before creating the wrapper
# export CAPSOLVER_API_KEY=your_key_here

wrapper = UdioWrapper(auth_token="your_token")
# make_request() now handles captcha automatically

Fixes #7