Initial commit: img-infinite-canvas AI design workbench MVP

Moteva-style AI design workbench replica. Home prompt creates a project;
the project page provides an infinite canvas with node drag, zoom/pan,
a design chat panel, history replay, image asset upload, and project
save/regenerate.

- Backend: go-zero, DDD layering, sqlc/pgx, optional PostgreSQL; memory
  or Redis cache; asynq job queue; MinIO/S3/R2/OSS object storage;
  sky-valley/pi agent runtime adapter.
- Frontend: Next.js App Router + Vite artifact build, TypeScript, i18n,
  shadcn/ui components, auth (OTP/Turnstile/Google/WeChat).
- Deploy: Docker Compose and k3s manifests.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

server/internal/logic/extract_node_text_async_logic.go

@@ -0,0 +1,39 @@
+// Code scaffolded by goctl. Safe to edit.
+// goctl 1.10.1
+
+package logic
+
+import (
+	"context"
+
+	"img_infinite_canvas/internal/svc"
+	"img_infinite_canvas/internal/types"
+
+	"github.com/zeromicro/go-zero/core/logx"
+)
+
+type ExtractNodeTextAsyncLogic struct {
+	logx.Logger
+	ctx    context.Context
+	svcCtx *svc.ServiceContext
+}
+
+func NewExtractNodeTextAsyncLogic(ctx context.Context, svcCtx *svc.ServiceContext) *ExtractNodeTextAsyncLogic {
+	return &ExtractNodeTextAsyncLogic{
+		Logger: logx.WithContext(ctx),
+		ctx:    ctx,
+		svcCtx: svcCtx,
+	}
+}
+
+func (l *ExtractNodeTextAsyncLogic) ExtractNodeTextAsync(req *types.ExtractNodeTextAsyncRequest) (resp *types.AgentThreadResponse, err error) {
+	feature := req.Feature
+	if req.Eitdortxt != "" {
+		feature = "eitdortxt"
+	}
+	thread, err := l.svcCtx.DesignService.ExtractNodeTextAsync(l.ctx, req.Id, req.NodeId, feature)
+	if err != nil {
+		return nil, err
+	}
+	return toAPIAgentThread(thread), nil
+}