refactor: plugin catalog + nextcloud policy

extensions/nextcloud-talk/src/normalize.ts

@@ -0,0 +1,31 @@
+export function normalizeNextcloudTalkMessagingTarget(raw: string): string | undefined {
+  const trimmed = raw.trim();
+  if (!trimmed) return undefined;
+
+  let normalized = trimmed;
+
+  if (normalized.startsWith("nextcloud-talk:")) {
+    normalized = normalized.slice("nextcloud-talk:".length).trim();
+  } else if (normalized.startsWith("nc-talk:")) {
+    normalized = normalized.slice("nc-talk:".length).trim();
+  } else if (normalized.startsWith("nc:")) {
+    normalized = normalized.slice("nc:".length).trim();
+  }
+
+  if (normalized.startsWith("room:")) {
+    normalized = normalized.slice("room:".length).trim();
+  }
+
+  if (!normalized) return undefined;
+
+  return `nextcloud-talk:${normalized}`.toLowerCase();
+}
+
+export function looksLikeNextcloudTalkTargetId(raw: string): boolean {
+  const trimmed = raw.trim();
+  if (!trimmed) return false;
+
+  if (/^(nextcloud-talk|nc-talk|nc):/i.test(trimmed)) return true;
+
+  return /^[a-z0-9]{8,}$/i.test(trimmed);
+}