Add deposit signature

[evgeny-stakewise]

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[Copilot]

Pull request overview

This pull request extends the DVT (Distributed Validator Technology) Relayer to handle deposit signatures in addition to exit signatures. The changes enable DVT Sidecars to submit and reconstruct both deposit and exit signature shares, expanding the service's functionality from only handling validator exits to managing the complete validator lifecycle.

Changes:

• Renamed API endpoints and schema classes to reflect broader scope (/exits → /validators, /exit-signature → /signatures)
• Added deposit signature handling alongside exit signatures with validation, reconstruction, and storage
• Refactored the Validator dataclass to make deposit-related fields (vault, amount, validator_type) required and added computed properties for withdrawal credentials and deposit data

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/validators/schema.py	Renamed schema classes from Exit-specific to general Signature/Validators naming; added deposit signature fields and validator metadata fields
src/validators/exit_signature.py	Added validate_deposit_signature function to validate deposit message signatures using sw_utils
src/validators/endpoints.py	Renamed endpoints; added parallel deposit signature share handling with reconstruction and validation logic
src/relayer/typings.py	Refactored Validator dataclass to require vault/amount/validator_type; added deposit_signature fields and properties for withdrawal_credentials and deposit_data_root
src/relayer/endpoints.py	Updated validator creation to provide required vault field; added deposit signature readiness check for registration flow

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