feat(cli): centralize terminal tips and add proxy guidance for blocked sites

[kaifcodec]

• Introduce user_scanner/cli/tips.py to centralize CLI advice, user hints, and third-party intelligence service notices.
• Move Hudson Rock infostealer remediation guidance from user_scanner/core/hudson.py into tips.py.
• Move loud module skip explanations from user_scanner/__main__.py into tips.py.
• Add proxy guidance that triggers only when scans encounter regional blocks, WAF 403s, 429 rate limits, or connection timeouts, advising users to route queries via -P/--proxy-file (including tested residential/datacenter provider details and partner discount).
• Suppress proxy recommendations automatically if the user has already configured --proxy-file or if all modules succeeded without unreachable errors.