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/meta/backfill_import_test.go

@@ -0,0 +1,59 @@
+package meta
+
+import (
+	"context"
+	"testing"
+
+	"aijianzhan/platform/internal/blueprint"
+)
+
+func TestBackfillDefaultImportExport(t *testing.T) {
+	store := NewMemoryStore()
+	bp := &blueprint.Blueprint{}
+	bp.Meta.Name = "coerce"
+	bp.Meta.Slug = "coerce_fields"
+	bp.Apis.Resources = []blueprint.APIResource{{
+		Path:       "items",
+		Entity:     "item",
+		Operations: []string{"list", "get", "create", "update", "delete"},
+	}}
+	bp.Entities = []blueprint.Entity{{Name: "item", Table: "item", PrimaryKey: "id"}}
+	bp.Pages = []blueprint.Page{{ID: "list1", Type: "list", Layout: &blueprint.PageLayout{Actions: []string{"create", "refresh"}}}}
+	_ = store.Save(context.Background(), &AppRecord{
+		AppID: "a1", TenantID: 1, Slug: "coerce_fields", Name: "coerce",
+		Status: StatusPublished, Blueprint: bp,
+	})
+
+	dry, err := BackfillDefaultImportExport(context.Background(), store, true)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if dry.Updated != 1 {
+		t.Fatalf("dry updated=%d", dry.Updated)
+	}
+	app, _ := store.GetBySlug(context.Background(), 1, "coerce_fields")
+	if hasImport(app.Blueprint.Apis.Resources[0].Operations) {
+		t.Fatal("dry run should not persist")
+	}
+
+	res, err := BackfillDefaultImportExport(context.Background(), store, false)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if res.Updated != 1 {
+		t.Fatalf("updated=%d", res.Updated)
+	}
+	app, _ = store.GetBySlug(context.Background(), 1, "coerce_fields")
+	if !hasImport(app.Blueprint.Apis.Resources[0].Operations) {
+		t.Fatalf("ops=%v", app.Blueprint.Apis.Resources[0].Operations)
+	}
+}
+
+func hasImport(ops []string) bool {
+	for _, op := range ops {
+		if op == "import" {
+			return true
+		}
+	}
+	return false
+}