feat(pds): proxy unhandled XRPC requests to Bluesky AppView (#8)

Proxies unhandled XRPC requests to api.bsky.app, enabling AppView
endpoints (feeds, profiles, notifications, DMs, moderation).

Also adds stub endpoints for:
- app.bsky.actor.getPreferences (returns empty preferences)
- app.bsky.ageassurance.getState (returns assured status)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Author: ascorbic

packages/pds/src/index.ts

@@ -6,6 +6,7 @@ export { Sequencer } from "./sequencer";
 
 import { Hono } from "hono";
 import { cors } from "hono/cors";
+import { proxy } from "hono/proxy";
 import { env } from "cloudflare:workers";
 import { ensureValidDid, ensureValidHandle } from "@atproto/syntax";
 import { requireAuth } from "./middleware/auth";
@@ -175,4 +176,12 @@ app.get("/xrpc/app.bsky.ageassurance.getState", requireAuth, (c) => {
 	});
 });
 
+// Proxy unhandled XRPC requests to Bluesky AppView
+app.all("/xrpc/*", (c) => {
+	const url = new URL(c.req.url);
+	url.host = "api.bsky.app";
+	url.protocol = "https:";
+	return proxy(url);
+});
+
 export default app;