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The Lark integration was locked to a single open-platform host chosen
deployment-wide (MULTICA_LARK_HTTP_BASE_URL / _CALLBACK_BASE_URL,
defaulting to open.feishu.cn), so one deployment could talk to only the
mainland Feishu cloud OR Lark international — never both. Teams on the
other tenant could not use the integration at all.
Make the host per-installation. The device-flow installer already
auto-detects the tenant (Lark emits tenant_brand="lark" mid-poll); we now
persist that as lark_installation.region, carry it on
InstallationCredentials.Region, and resolve the open-platform host per
call (REST + WS bootstrap) from the region. An explicit cfg.BaseURL
(env / httptest) still overrides every region, so existing tests and
staging/proxy setups keep working.
- migration 116: lark_installation.region TEXT NOT NULL DEFAULT 'feishu'
CHECK (region IN ('feishu','lark')) — existing rows are all mainland.
- lark.Region enum + OpenPlatformBaseURL/RegionOrDefault helpers.
- registration: thread the detected region into finishSuccess so the
install-time GetBotInfo hits the right cloud AND the row records it.
- every credential-build site (patcher, replier, WS provider, union_id
backfill) copies region off the installation row.
- region is part of the WS supervisor fingerprint so a re-install that
switches cloud restarts the connection.
- API: surface region on the installation listing DTO.
MUL-3083
Co-authored-by: multica-agent <github@multica.ai>