Inject web search capability for Claude Console (API Key) accounts that
don't natively support Anthropic's web_search tool. When a pure
web_search request is detected, the gateway calls Brave Search or Tavily
API directly and constructs an Anthropic-protocol-compliant SSE/JSON
response without forwarding to upstream.
Backend:
- New `pkg/websearch/` SDK: Brave and Tavily provider implementations
with io.LimitReader, proxy support, and Redis-based quota tracking
(Lua atomic INCR + TTL, DECR rollback on failure)
- Global config via `settings.web_search_emulation_config` (JSON) with
in-process cache + singleflight, input validation, API key merge on
save, and sanitized API responses
- Channel-level toggle via `channels.features_config` JSONB column
(DB migration 101)
- Account-level toggle via `accounts.extra.web_search_emulation`
- Request interception in `Forward()` with SSE streaming response
construction using json.Marshal (no manual string concatenation)
- Manager hot-reload: `RebuildWebSearchManager()` called on config save
and startup via `SetWebSearchRedisClient()`
- 70 unit tests covering providers, manager, config validation,
sanitization, tool detection, query extraction, and response building
Frontend:
- Settings → Gateway tab: Web Search Emulation config card with global
toggle, provider list (add/remove, API key, priority, quota, proxy)
- Channels → Anthropic tab: web search emulation toggle with global
state linkage (disabled when global off)
- Account Create/Edit modals: web search emulation toggle for API Key
type with Toggle component
- Full i18n coverage (zh + en)
