/claim #7743

Adds a configurable Proxy Timeout field (in seconds) to all 8 database types when exposed publicly.

When timeout = 0 (default): sets proxy_timeout 365d (effectively no timeout). When timeout > 0: sets proxy_timeout Xs for the user-specified value.

This resolves long-running queries failing due to the nginx TCP proxy timing out after ~10 minutes.

Changes:

• Migration adds public_proxy_timeout to all 9 database tables
• StartDatabaseProxy.php injects proxy_timeout into nginx stream config
• UI input field added to all 8 database type views
• All 8 Livewire components updated with validation

Fixes #7743