Add R2 image uploads to admin

backend/internal/admin/r2_test.go

@@ -0,0 +1,30 @@
+package admin
+
+import "testing"
+
+func TestNormalizeR2ConfigSplitsBucketPath(t *testing.T) {
+	cfg, err := normalizeR2Config(R2Config{
+		Endpoint:        "https://example.r2.cloudflarestorage.com/stroage",
+		Bucket:          "stroage/Image/",
+		AccessKeyID:     "access-key",
+		SecretAccessKey: "secret-key",
+		Region:          "auto",
+		PublicBaseURL:   "r2.example.com",
+		MaxUploadBytes:  20,
+	})
+	if err != nil {
+		t.Fatalf("normalizeR2Config returned error: %v", err)
+	}
+	if cfg.Endpoint != "https://example.r2.cloudflarestorage.com" {
+		t.Fatalf("unexpected endpoint: %s", cfg.Endpoint)
+	}
+	if cfg.Bucket != "stroage" {
+		t.Fatalf("unexpected bucket: %s", cfg.Bucket)
+	}
+	if cfg.Prefix != "Image" {
+		t.Fatalf("unexpected prefix: %s", cfg.Prefix)
+	}
+	if cfg.PublicBaseURL != "https://r2.example.com" {
+		t.Fatalf("unexpected public base URL: %s", cfg.PublicBaseURL)
+	}
+}