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/create_project_async_logic.go

@@ -0,0 +1,40 @@
+// 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 CreateProjectAsyncLogic struct {
+	logx.Logger
+	ctx    context.Context
+	svcCtx *svc.ServiceContext
+}
+
+func NewCreateProjectAsyncLogic(ctx context.Context, svcCtx *svc.ServiceContext) *CreateProjectAsyncLogic {
+	return &CreateProjectAsyncLogic{
+		Logger: logx.WithContext(ctx),
+		ctx:    ctx,
+		svcCtx: svcCtx,
+	}
+}
+
+func (l *CreateProjectAsyncLogic) CreateProjectAsync(req *types.CreateProjectRequest) (resp *types.ProjectResponse, err error) {
+	if err := validateRequiredPrompt(req.Prompt, req.AllowEmptyPrompt); err != nil {
+		return nil, err
+	}
+
+	project, err := l.svcCtx.DesignService.CreateProjectAsync(l.ctx, req.Title, req.Prompt, req.ImageModel, req.ImageSize, req.EnableWebSearch)
+	if err != nil {
+		return nil, err
+	}
+
+	return toProjectResponse(project), nil
+}