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/infrastructure/postgres/db/querier.go

@@ -0,0 +1,34 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.30.0
+
+package db
+
+import (
+	"context"
+
+	"github.com/jackc/pgx/v5/pgtype"
+)
+
+type Querier interface {
+	CreateCanvasSnapshot(ctx context.Context, arg CreateCanvasSnapshotParams) error
+	CreateConnection(ctx context.Context, arg CreateConnectionParams) error
+	CreateMessage(ctx context.Context, arg CreateMessageParams) error
+	DeleteConnectionsByProject(ctx context.Context, arg DeleteConnectionsByProjectParams) error
+	DeleteMessagesByProject(ctx context.Context, arg DeleteMessagesByProjectParams) error
+	DeleteNodesByProject(ctx context.Context, arg DeleteNodesByProjectParams) error
+	DeleteProject(ctx context.Context, arg DeleteProjectParams) error
+	GetCanvasSnapshot(ctx context.Context, arg GetCanvasSnapshotParams) (CanvasSnapshot, error)
+	GetProject(ctx context.Context, arg GetProjectParams) (Project, error)
+	ListConnectionsByProject(ctx context.Context, arg ListConnectionsByProjectParams) ([]CanvasConnection, error)
+	ListMessagesByProject(ctx context.Context, arg ListMessagesByProjectParams) ([]AgentMessage, error)
+	ListNodesByProject(ctx context.Context, arg ListNodesByProjectParams) ([]CanvasNode, error)
+	ListProjects(ctx context.Context, userID pgtype.UUID) ([]ListProjectsRow, error)
+	ListProjectsPage(ctx context.Context, arg ListProjectsPageParams) ([]ListProjectsPageRow, error)
+	LockProject(ctx context.Context, arg LockProjectParams) (LockProjectRow, error)
+	UpdateProjectCanvasSnapshot(ctx context.Context, arg UpdateProjectCanvasSnapshotParams) error
+	UpsertCanvasNode(ctx context.Context, arg UpsertCanvasNodeParams) error
+	UpsertProject(ctx context.Context, arg UpsertProjectParams) error
+}
+
+var _ Querier = (*Queries)(nil)