feat: initial meshservice implementation

Generic decentralized service layer for mesh networks.
Includes FAPP (psychotherapy) and Housing as reference services.

- ServiceMessage with Ed25519 signatures
- Wire protocol (64-byte header + CBOR)
- ServiceRouter with pluggable handlers
- Verification framework (3 trust levels)
- 32 tests, 3 examples

target/debug/.fingerprint/curve25519-dalek-da7b1e961a8af266/invoked.timestamp

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+This file has an mtime of when this was started.

target/debug/.fingerprint/curve25519-dalek-da7b1e961a8af266/lib-curve25519_dalek

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+eea5a32d17e7bacf

target/debug/.fingerprint/curve25519-dalek-da7b1e961a8af266/lib-curve25519_dalek.json

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