fix AT-URI resolution: handle :// normalization via reroute hook (#1210)
Cloudflare collapses // to / in URL paths, so /at://did:plc:xxx/...
arrives as /at:/did:plc:xxx/... which doesn't match the routes/at/
directory. add a SvelteKit reroute hook that normalizes /at:/ and
/at:// prefixes to /at/ before routing.
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
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