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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