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/domain/design/jobs.go

@@ -0,0 +1,52 @@
+package design
+
+import "context"
+
+type JobKind string
+
+const (
+	JobCreateProjectGeneration JobKind = "canvas:create-project-generation"
+	JobFollowupGeneration      JobKind = "canvas:followup-generation"
+	JobNodeActionGeneration    JobKind = "canvas:node-action-generation"
+	JobAgentConversation       JobKind = "canvas:agent-conversation"
+	JobTextExtraction          JobKind = "canvas:text-extraction"
+	JobMockupModelGeneration   JobKind = "canvas:mockup-model-generation"
+	JobLayerMergeGeneration    JobKind = "canvas:layer-merge-generation"
+	JobAssetCleanup            JobKind = "asset:cleanup"
+)
+
+type Job struct {
+	Kind            JobKind
+	UserID          string
+	ProjectID       string
+	ThreadID        string
+	Prompt          string
+	Mode            string
+	ImageModel      string
+	ImageSize       string
+	TaskPlan        AgentTaskPlan
+	EnableWebSearch bool
+	Isolated        bool
+	Target          Node
+	Request         NodeActionRequest
+	MessageID       string
+	Conversation    AgentConversationRequest
+	Messages        []AgentChatMessage
+	Feature         string
+	PlaceholderID   string
+	SourceNodes     []Node
+	Title           string
+	PublicURLs      []string
+}
+
+type JobQueue interface {
+	Enqueue(ctx context.Context, job Job) error
+}
+
+type JobProcessor interface {
+	ProcessJob(ctx context.Context, job Job) error
+}
+
+type JobFailureHandler interface {
+	HandleJobFailure(ctx context.Context, job Job, err error) error
+}