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Self-contained hashcash-style PoW on /submit: client finds a nonce so
SHA-256("<unix-ts>:<nonce>") has enough leading zero bits, sent as an
X-Nymdrop-Pow header; server verifies and rejects expired or replayed
stamps, no challenge round-trip required. Difficulty tunable via
--pow-difficulty without a rebuild.
Also fixes a latent bug in the browser crypto: X25519 was being
requested as ECDH with namedCurve "X25519", which is not a valid
WebCrypto combination and always throws. Modern WebCrypto exposes
X25519 as its own algorithm identifier.
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