feat: extract cms from mp/cms — initial libreshop/cms

Source moved verbatim from mp/cms/ on 2026-04-29; mp was the first
concrete adapter consuming the libreshop toolkit. Builds and publishes
git.librete.ch/libreshop/cms on every main / v* push via the standard
.gitea/workflows/build.yml shared across libreshop components.

config/server.ts

@@ -0,0 +1,13 @@
+export default ({ env }) => ({
+	host: env("HOST", "0.0.0.0"),
+	port: env.int("PORT", 5555),
+	app: {
+		keys: env.array("APP_KEYS")
+	},
+	webhooks: {
+		populateRelations: env.bool("WEBHOOKS_POPULATE_RELATIONS", false)
+	},
+	logger: {
+		level: "info"
+	}
+});