refactor(core): migrate channel identity and binding across app

Align channel identity and bind flow across backend and app-facing layers, including generated swagger artifacts and package lock updates while excluding docs content changes.

db/queries/bind.sql

@@ -0,0 +1,22 @@
+-- name: CreateBindCode :one
+INSERT INTO channel_identity_bind_codes (token, issued_by_user_id, platform, expires_at)
+VALUES ($1, $2, $3, $4)
+RETURNING id, token, issued_by_user_id, platform, expires_at, used_at, used_by_channel_identity_id, created_at;
+
+-- name: GetBindCode :one
+SELECT id, token, issued_by_user_id, platform, expires_at, used_at, used_by_channel_identity_id, created_at
+FROM channel_identity_bind_codes
+WHERE token = $1;
+
+-- name: GetBindCodeForUpdate :one
+SELECT id, token, issued_by_user_id, platform, expires_at, used_at, used_by_channel_identity_id, created_at
+FROM channel_identity_bind_codes
+WHERE token = $1
+FOR UPDATE;
+
+-- name: MarkBindCodeUsed :one
+UPDATE channel_identity_bind_codes
+SET used_at = now(), used_by_channel_identity_id = $2
+WHERE id = $1
+  AND used_at IS NULL
+RETURNING id, token, issued_by_user_id, platform, expires_at, used_at, used_by_channel_identity_id, created_at;