feat: add Z12/Z13 bind APIs, stock import, and sync docs

Enable auto default sync channels on agent activate, bind-code/phone confirm flows, publish ALTER, and align admin/yuheng docs with the production bind path.

platform/internal/logic/applogic/publish.go

@@ -347,6 +347,26 @@ func (l *PublishLogic) Publish(slug string, req *types.PublishReq) (*types.Publi
 		}
 	}
 
+	// Z11a：蓝图新增字段 → ALTER TABLE ADD COLUMN IF NOT EXISTS
+	inspectDB := appDB
+	if inspectDB == nil {
+		inspectDB = l.svcCtx.DB
+	}
+	if inspectDB != nil {
+		alter, err := schema.BuildPostgresAlterDDL(l.ctx, inspectDB, bp)
+		if err != nil {
+			rec.Status = meta.StatusFailed
+			rec.Error = err.Error()
+			_ = l.svcCtx.Meta.Save(l.ctx, rec)
+			return nil, fmt.Errorf("build alter ddl: %w", err)
+		}
+		if len(alter) > 0 {
+			ddl = schema.MergeDDL(ddl, alter)
+			rec.DDL = ddl
+			_ = l.svcCtx.Meta.Save(l.ctx, rec)
+		}
+	}
+
 	if err := runner.ExecDDL(l.ctx, ddl); err != nil {
 		rec.Status = meta.StatusFailed
 		rec.Error = err.Error()