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/oauth2_scopes.go

@@ -0,0 +1,33 @@
+// 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/coredata"
+
+const (
+	ScopeV1ResourceAliasRead coredata.OAuth2Scope = "v1:resource-alias:read"
+	ScopeV1ResourceAlias     coredata.OAuth2Scope = "v1:resource-alias"
+)
+
+// OAuth2ScopeMappings maps OAuth2 scopes to resource-alias actions.
+var OAuth2ScopeMappings = map[coredata.OAuth2Scope][]string{
+	ScopeV1ResourceAliasRead: {
+		ActionAliasGet,
+	},
+	ScopeV1ResourceAlias: {
+		ActionAliasSet,
+		ActionAliasRemove,
+	},
+}