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/svc/servicecontext.go

@@ -11,6 +11,7 @@ import (
 	"aijianzhan/platform/internal/agentstore"
 	"aijianzhan/platform/internal/audit"
 	"aijianzhan/platform/internal/authx"
+	"aijianzhan/platform/internal/bindcodestore"
 	"aijianzhan/platform/internal/config"
 	"aijianzhan/platform/internal/crud"
 	"aijianzhan/platform/internal/dbsync"
@@ -47,6 +48,7 @@ type ServiceContext struct {
 	DB         *sql.DB
 	JWT        authx.JWTConfig
 	DBSync     *dbsync.Manager
+	BindCodes  bindcodestore.Store
 	TenantPerm tenantperm.Store
 	SMS        *smsstore.Store
 	License    *license.Manager
@@ -160,6 +162,12 @@ func NewServiceContext(c config.Config) *ServiceContext {
 			return ok
 		}
 	}
+	// Z9e：存量已发布模块补齐 import/export（不依赖用户再发布）
+	if ctx.Meta != nil && !ctx.MemoryMode {
+		bfCtx, bfCancel := context.WithTimeout(context.Background(), 30*time.Second)
+		meta.RunBackfillDefaultImportExportOnBoot(bfCtx, ctx.Meta)
+		bfCancel()
+	}
 	if c.DryRun {
 		ctx.Schema = schema.NoopRunner{}
 	}
@@ -176,6 +184,11 @@ func NewServiceContext(c config.Config) *ServiceContext {
 		} else {
 			ctx.DBSync = dbsync.NewManager(store)
 			log.Printf("dbsync middleware enabled (dir=%s)", dir)
+			if bc, err := bindcodestore.NewFileStore(dir); err != nil {
+				log.Printf("bind code store: %v", err)
+			} else {
+				ctx.BindCodes = bc
+			}
 		}
 	}