feat(shangwutong): sync customer names back to channel (#3)

Co-authored-by: Rogee <rogee@ipao.vip>

backend/migrations/000077_add_contact_inbox_channel_metadata.down.sql

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+ALTER TABLE contact_inboxes
+    DROP COLUMN IF EXISTS channel_metadata;

backend/migrations/000077_add_contact_inbox_channel_metadata.up.sql

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+ALTER TABLE contact_inboxes
+    ADD COLUMN IF NOT EXISTS channel_metadata JSONB NOT NULL DEFAULT '{}'::jsonb;