feat: worst-scan fansub web — initial release

Posts engine (SQLite + auto-publisher via poller), public feed with
clickable tags, reader, admin panel, submit/search/queue tools.
BFF proxy to pipeline API. Clean dark design. Docker-ready.

src/instrumentation.ts

@@ -0,0 +1,6 @@
+export async function register() {
+  if (process.env.NEXT_RUNTIME === "nodejs") {
+    const { startPoller } = await import("./lib/poller")
+    startPoller()
+  }
+}