feat(cli): containr migrate dflow + fix railway service types (#53)

dflow importer pages the Payload REST collections (users API-Key
auth) and recreates projects/services: app→git web services, docker
→image, database→typed image with DATABASE_URL for external
providers; variables (empty encrypted values flagged), bind volumes,
and domains carried over; soft-deleted docs excluded.

Also fixes the Railway migrator posting type "image"/"git" — the
create API only accepts web|worker|database|cron and requires an
environment, so every service create 400'd.

Generated with [Devin](https://devin.ai)

Co-authored-by: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

app/backend/internal/cli/commands/migrate_test.go

@@ -38,3 +38,85 @@ func TestEdgesOf(t *testing.T) {
 		t.Fatalf("edgesOf(nil conn) = %+v, want empty", got)
 	}
 }
+
+func TestDflowServicePlanOf(t *testing.T) {
+	appSvc := map[string]interface{}{
+		"id":           "s1",
+		"name":         "api",
+		"type":         "app",
+		"providerType": "github",
+		"githubSettings": map[string]interface{}{
+			"owner": "acme", "repository": "api", "branch": "main",
+			"buildPath": "/", "port": float64(8080),
+		},
+		"variables": []interface{}{
+			map[string]interface{}{"key": "FOO", "value": "bar"},
+			map[string]interface{}{"key": "EMPTY", "value": ""},
+		},
+		"domains": []interface{}{
+			map[string]interface{}{"domain": "api.example.com"},
+		},
+		"volumes": []interface{}{
+			map[string]interface{}{"hostPath": "/data", "containerPath": "/app/data"},
+		},
+	}
+	plan, warn := dflowServicePlanOf(appSvc)
+	if plan.Type != "web" || plan.GitRepo != "https://github.com/acme/api" || plan.Port != 8080 {
+		t.Fatalf("app plan = %+v", plan)
+	}
+	if plan.Variables["FOO"] != "bar" || len(plan.Domains) != 1 || len(plan.Volumes) != 1 {
+		t.Fatalf("plan detail = %+v", plan)
+	}
+	if len(warn) != 1 { // EMPTY value flagged
+		t.Fatalf("warnings = %v", warn)
+	}
+
+	dbSvc := map[string]interface{}{
+		"id": "s2", "name": "pg", "type": "database",
+		"databaseDetails": map[string]interface{}{
+			"type": "postgres", "version": "16", "provider": "external",
+			"connectionUrl": "postgres://u:p@h:5432/db",
+		},
+	}
+	dplan, _ := dflowServicePlanOf(dbSvc)
+	if dplan.Type != "database" || dplan.Image != "postgres:16" {
+		t.Fatalf("db plan = %+v", dplan)
+	}
+	if dplan.Variables["DATABASE_URL"] != "postgres://u:p@h:5432/db" {
+		t.Fatalf("db vars = %+v", dplan.Variables)
+	}
+
+	dockerSvc := map[string]interface{}{
+		"id": "s3", "name": "img", "type": "docker",
+		"dockerDetails": map[string]interface{}{
+			"url": "ghrc://acme/web:v1",
+			"ports": []interface{}{
+				map[string]interface{}{"hostPort": float64(80), "containerPort": float64(3000), "scheme": "http"},
+			},
+		},
+	}
+	iplan, _ := dflowServicePlanOf(dockerSvc)
+	if iplan.Image != "ghcr.io/acme/web:v1" || iplan.Port != 3000 {
+		t.Fatalf("docker plan = %+v", iplan)
+	}
+}
+
+func TestDflowRepoURL(t *testing.T) {
+	cases := []struct {
+		provider, owner, repo, want string
+	}{
+		{"github", "acme", "api", "https://github.com/acme/api"},
+		{"gitlab", "acme", "api", "https://gitlab.com/acme/api"},
+		{"bitbucket", "acme", "api", "https://bitbucket.org/acme/api"},
+		{"gitea", "acme", "api", ""},
+		{"github", "acme", "api.git", "https://github.com/acme/api"},
+		{"github", "", "api", ""},
+		{"github", "acme", "", ""},
+		{"github", "acme", "https://git.example.com/a/b", "https://git.example.com/a/b"},
+	}
+	for _, c := range cases {
+		if got := dflowRepoURL(c.provider, c.owner, c.repo); got != c.want {
+			t.Errorf("dflowRepoURL(%q,%q,%q) = %q, want %q", c.provider, c.owner, c.repo, got, c.want)
+		}
+	}
+}