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/cache/redis_store.go

@@ -0,0 +1,57 @@
+package cache
+
+import (
+	"context"
+	"encoding/json"
+	"time"
+
+	"github.com/redis/go-redis/v9"
+)
+
+type RedisOptions struct {
+	Addr     string
+	Password string
+	DB       int
+}
+
+type RedisStore struct {
+	client *redis.Client
+}
+
+func NewRedisStore(ctx context.Context, opts RedisOptions) (*RedisStore, error) {
+	client := redis.NewClient(&redis.Options{
+		Addr:     opts.Addr,
+		Password: opts.Password,
+		DB:       opts.DB,
+	})
+	if err := client.Ping(ctx).Err(); err != nil {
+		return nil, err
+	}
+	return &RedisStore{client: client}, nil
+}
+
+func (s *RedisStore) Get(ctx context.Context, key string, target any) (bool, error) {
+	value, err := s.client.Get(ctx, key).Bytes()
+	if err != nil {
+		if err == redis.Nil {
+			return false, nil
+		}
+		return false, err
+	}
+	if err := json.Unmarshal(value, target); err != nil {
+		return false, err
+	}
+	return true, nil
+}
+
+func (s *RedisStore) Set(ctx context.Context, key string, value any, ttl time.Duration) error {
+	data, err := json.Marshal(value)
+	if err != nil {
+		return err
+	}
+	return s.client.Set(ctx, key, data, ttl).Err()
+}
+
+func (s *RedisStore) Delete(ctx context.Context, key string) error {
+	return s.client.Del(ctx, key).Err()
+}