init: 毛孩子计划 小程序 + Go 后端 + 内嵌后台

- pets-fe: 微信原生小程序（首页/计划/记录/报告/社区/引导），
  服务端驱动、无假数据；弹层改用 scroll-view，打开时隐藏自定义 tabBar
- pets-be: Gin + GORM(MySQL, sundynix_ 前缀) + MinIO，统一响应/分页，
  微信 code2session 登录，provider-neutral AI(DeepSeek)，go:embed React 后台
- 修复：分段选择类型不匹配（字符串 vs 数字）导致选不中

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

pets-be/internal/storage/minio.go

@@ -0,0 +1,85 @@
+package storage
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"strings"
+	"time"
+
+	"github.com/minio/minio-go/v7"
+	"github.com/minio/minio-go/v7/pkg/credentials"
+
+	"github.com/sundynix/pets-be/internal/config"
+)
+
+// Storage MinIO 对象存储封装
+type Storage struct {
+	client        *minio.Client
+	bucket        string
+	publicBaseURL string
+}
+
+// New 初始化 MinIO 客户端，并确保 bucket 存在且可公开下载
+func New(cfg config.MinIOConfig) (*Storage, error) {
+	client, err := minio.New(cfg.Endpoint, &minio.Options{
+		Creds:  credentials.NewStaticV4(cfg.AccessKey, cfg.SecretKey, ""),
+		Secure: cfg.UseSSL,
+	})
+	if err != nil {
+		return nil, fmt.Errorf("minio new: %w", err)
+	}
+
+	s := &Storage{
+		client:        client,
+		bucket:        cfg.Bucket,
+		publicBaseURL: strings.TrimRight(cfg.PublicBaseURL, "/"),
+	}
+	if err := s.ensureBucket(); err != nil {
+		return nil, err
+	}
+	return s, nil
+}
+
+func (s *Storage) ensureBucket() error {
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	exists, err := s.client.BucketExists(ctx, s.bucket)
+	if err != nil {
+		return fmt.Errorf("bucket exists: %w", err)
+	}
+	if !exists {
+		if err := s.client.MakeBucket(ctx, s.bucket, minio.MakeBucketOptions{}); err != nil {
+			return fmt.Errorf("make bucket: %w", err)
+		}
+	}
+	// dev：设置公开只读策略，便于直接以 URL 访问对象
+	policy := fmt.Sprintf(`{
+		"Version": "2012-10-17",
+		"Statement": [{
+			"Effect": "Allow",
+			"Principal": {"AWS": ["*"]},
+			"Action": ["s3:GetObject"],
+			"Resource": ["arn:aws:s3:::%s/*"]
+		}]
+	}`, s.bucket)
+	if err := s.client.SetBucketPolicy(ctx, s.bucket, policy); err != nil {
+		return fmt.Errorf("set bucket policy: %w", err)
+	}
+	return nil
+}
+
+// Upload 上传对象，返回可公开访问的 URL
+func (s *Storage) Upload(objectName string, reader io.Reader, size int64, contentType string) (string, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	_, err := s.client.PutObject(ctx, s.bucket, objectName, reader, size, minio.PutObjectOptions{
+		ContentType: contentType,
+	})
+	if err != nil {
+		return "", fmt.Errorf("put object: %w", err)
+	}
+	return fmt.Sprintf("%s/%s/%s", s.publicBaseURL, s.bucket, objectName), nil
+}