Add PySocks dependency and shared src/derp/http.py module providing
proxy-aware urlopen() and build_opener() that route through
socks5h://127.0.0.1:1080. Subclassed SocksiPyHandler passes SSL
context through to HTTPS connections.
Swapped 14 external-facing plugins to use the proxied helpers.
Local-only traffic (SearXNG, raw DNS/TLS sockets) stays direct.
Updated test mocks in test_twitch and test_alert accordingly.
Query Wayback Machine availability API via urllib + executor.
Supports optional timestamp parameter for date-targeted lookups.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
