Implements #2646: the risk-control content audit can now send OpenAI
Moderations requests through a proxy from IP Management - Proxy Servers.
Backend:
- ContentModerationConfig gains proxy_id (nil = direct, unchanged default)
- update semantics: null keeps, 0 clears, >0 selects (validated to exist)
- moderation calls build the client via the shared httpclient pool; proxy
resolution failure surfaces as a moderation error and never silently
falls back to direct connection
- proxy_id -> URL resolution cached 60s (single-entry, invalidated on
config save) so the pre-block hot path does not hit the DB per request
- test-key endpoint accepts proxy_id too (null = saved config's proxy,
0 = force direct), so input-key/saved-key tests exercise the same path
- proxy usage/inactivity logged (content_moderation.proxy_enabled /
proxy_not_active) without leaking credentials
Frontend:
- ProxySelector in the risk-control basic settings tab, proxy list loaded
non-blockingly; save and test payloads carry proxy_id; zh/en i18n
shaw