integrate real ATProto labeler for spam detection
- add labeler/ cloudflare worker with proper label signing
- secp256k1 + DAG-CBOR label signatures
- queryLabels XRPC endpoint
- spam management endpoints
- create labeler DID (did:plc:x6io7svnbth4pikg2e63vvkx)
- update pds.js to check labeler before accepting messages
- update frontend LabelerClient to use remote labeler
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>