feat: harden loose-offline sync for user JWT, schema, and console ops

Enable Binding-scoped agent push/pull, empty-table schema ensure, SyncPage inspect/drop-table, default module import, and agent-bound publish docs from the 宇恒联调意见.

Co-authored-by: Cursor <cursoragent@cursor.com>

platform/internal/meta/migrate.go

@@ -124,6 +124,14 @@ CREATE TABLE IF NOT EXISTS platform_meta.role_permissions (
 ALTER TABLE platform_meta.agent_accounts
     ADD COLUMN IF NOT EXISTS role_id BIGINT;
 
+-- Z8b：智能体绑定同步通道 / 线上库 / 模块落库名
+ALTER TABLE platform_meta.agent_accounts
+    ADD COLUMN IF NOT EXISTS channel_id VARCHAR(128) NOT NULL DEFAULT '';
+ALTER TABLE platform_meta.agent_accounts
+    ADD COLUMN IF NOT EXISTS online_db_id VARCHAR(128) NOT NULL DEFAULT '';
+ALTER TABLE platform_meta.agent_accounts
+    ADD COLUMN IF NOT EXISTS database_name VARCHAR(128) NOT NULL DEFAULT '';
+
 -- 租户邀请码：pending 用户凭码加入已有公司
 CREATE TABLE IF NOT EXISTS platform_meta.tenant_invites (
     invite_id   BIGSERIAL PRIMARY KEY,