feat(plugins): listenbrainz and lastfm

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

plugins/lastfm/index.ts

@@ -0,0 +1,19 @@
+import { definePlugin } from "@sttracker/plugin-sdk/types";
+import { pull, pullChanges } from "./src/lastfm.ts";
+
+export default definePlugin({
+  manifest: {
+    id: "lastfm",
+    name: "Last.fm",
+    version: "0.1.0",
+    sdkVersion: 1,
+    mediaTypes: ["track", "album", "artist"],
+    capabilities: ["pull", "pullChanges"],
+    config: [
+      { key: "username", label: "Username", type: "string", required: true },
+      { key: "apiKey", label: "API key", type: "secret", required: true },
+    ],
+  },
+  pull,
+  pullChanges,
+});