refactor(architecture): eliminate internal package and complete cordis single-owner model and repository migration

- Physically purged all legacy internal/ packages, centralized pkg/model/ and pkg/repository/
- Migrated domain models and database repositories into self-contained owner plugins (user, auth, message_gateway, admin, upload, risk_control)
- Decoupled cross-plugin interactions via pure core/contracts and typed EventBus
- Ensured 100% test coverage pass, zero data races (-race clean), and 0 lint issues in make code-check

plugins/infra/storage/objectstore/oss.go

@@ -0,0 +1,98 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package objectstore
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"strings"
+
+	"github.com/aliyun/alibabacloud-oss-go-sdk-v2/oss"
+	"github.com/aliyun/alibabacloud-oss-go-sdk-v2/oss/credentials"
+)
+
+type ossBackend struct {
+	client    *oss.Client
+	bucket    string
+	keyPrefix string
+	cdnURL    string
+}
+
+func newOSSBackend(cfg ObjectConfig) (*ossBackend, error) {
+	options := oss.LoadDefaultConfig().
+		WithCredentialsProvider(credentials.NewStaticCredentialsProvider(cfg.AccessKeyID, cfg.SecretAccessKey)).
+		WithRegion(cfg.Region)
+	if cfg.Endpoint != "" {
+		options.WithEndpoint(cfg.Endpoint)
+	}
+	return &ossBackend{
+		client:    oss.NewClient(options),
+		bucket:    cfg.Bucket,
+		keyPrefix: strings.Trim(cfg.KeyPrefix, "/"),
+		cdnURL:    strings.TrimRight(cfg.CDNURL, "/"),
+	}, nil
+}
+
+func (b *ossBackend) Put(ctx context.Context, key string, body io.Reader, _ int64, _ string) (PutResult, error) {
+	key = b.key(key)
+	_, err := b.client.PutObject(ctx, &oss.PutObjectRequest{
+		Bucket: oss.Ptr(b.bucket),
+		Key:    oss.Ptr(key),
+		Body:   body,
+	})
+	if err != nil {
+		return PutResult{}, fmt.Errorf("put OSS object: %w", err)
+	}
+	return PutResult{Key: key, Bucket: b.bucket}, nil
+}
+
+func (b *ossBackend) Get(ctx context.Context, key string) (*Object, error) {
+	key = b.key(key)
+	if b.cdnURL != "" {
+		return getHTTPObject(ctx, b.cdnURL, key)
+	}
+	output, err := b.client.GetObject(ctx, &oss.GetObjectRequest{
+		Bucket: oss.Ptr(b.bucket),
+		Key:    oss.Ptr(key),
+	})
+	if err != nil {
+		return nil, fmt.Errorf("get OSS object: %w", err)
+	}
+	contentType := defaultContentType
+	if output.ContentType != nil {
+		contentType = *output.ContentType
+	}
+	return &Object{Body: output.Body, ContentLength: output.ContentLength, ContentType: contentType}, nil
+}
+
+func (b *ossBackend) Delete(ctx context.Context, key string) error {
+	_, err := b.client.DeleteObject(ctx, &oss.DeleteObjectRequest{
+		Bucket: oss.Ptr(b.bucket),
+		Key:    oss.Ptr(b.key(key)),
+	})
+	if err != nil {
+		return fmt.Errorf("delete OSS object: %w", err)
+	}
+	return nil
+}
+
+func (b *ossBackend) Test(ctx context.Context) error {
+	ok, err := b.client.IsBucketExist(ctx, b.bucket)
+	if err != nil {
+		return fmt.Errorf("access OSS bucket: %w", err)
+	}
+	if !ok {
+		return fmt.Errorf("OSS bucket %q does not exist", b.bucket)
+	}
+	return nil
+}
+
+func (b *ossBackend) key(key string) string {
+	key = strings.TrimLeft(key, "/")
+	if b.keyPrefix == "" || strings.HasPrefix(key, b.keyPrefix+"/") {
+		return key
+	}
+	return b.keyPrefix + "/" + key
+}