Add resourcealias application service

Introduce a standalone resourcealias package with its own service,
IAM policies, and OAuth2 scopes so alias management no longer lives
inside the trust center services. Remove the trust-center-specific
alias services from probo and trust, and wire the new service into
probod, the server, and the API layer.

Signed-off-by: Bryan Frimin <bryan@probo.com>

pkg/resourcealias/policies.go

@@ -0,0 +1,55 @@
+// Copyright (c) 2025-2026 Probo Inc <hello@probo.com>.
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.
+
+package resourcealias
+
+import (
+	"go.probo.inc/probo/pkg/iam"
+	"go.probo.inc/probo/pkg/iam/policy"
+)
+
+var organizationCondition = policy.Equals("principal.organization_id", "resource.organization_id")
+
+// FullAccessPolicy grants complete resource-alias access to organization owners
+// and admins.
+var FullAccessPolicy = policy.NewPolicy(
+	"resourcealias:full-access",
+	"Resource Alias Full Access",
+	policy.Allow(
+		ActionAliasGet,
+		ActionAliasSet,
+		ActionAliasRemove,
+	).WithSID("resource-alias-full-access").When(organizationCondition),
+).WithDescription("Full resource-alias access including set and remove")
+
+// ReadAccessPolicy grants read-only resource-alias access to viewers and auditors.
+var ReadAccessPolicy = policy.NewPolicy(
+	"resourcealias:read-access",
+	"Resource Alias Read Access",
+	policy.Allow(
+		ActionAliasGet,
+	).WithSID("resource-alias-read-access").When(organizationCondition),
+).WithDescription("Read-only resource-alias access")
+
+// PolicySet returns the PolicySet for the resource-alias service. It is owned by
+// this package and registered into the authorizer at composition time so the
+// resource-alias authorization rules live alongside the resource-alias domain
+// logic instead of in the core probo policy set.
+func PolicySet() *iam.PolicySet {
+	return iam.NewPolicySet().
+		AddRolePolicy("OWNER", FullAccessPolicy).
+		AddRolePolicy("ADMIN", FullAccessPolicy).
+		AddRolePolicy("VIEWER", ReadAccessPolicy).
+		AddRolePolicy("AUDITOR", ReadAccessPolicy)
+}