Chore/cleanup dependencies

[zinodict121]

Pull Request: Remove unused dependencies

Resolves Issue: #249

Description

This PR cleans up the project's dependency tree by removing several crates from Cargo.toml that are no longer being used anywhere in the codebase.

I audited the project dependencies using cargo-machete which identified the following crates as completely unused:

• dcap-qvl
• ecdsa
• prost
• prost-types

Removing these dependencies helps to:

• Reduce overall compilation times.
• Minimize the binary footprint and attack surface.
• Keep the Cargo.toml lean and maintainable.

Changes Made

• Removed dcap-qvl, ecdsa, prost, and prost-types from Cargo.toml.
• (The lockfile will update on the next cargo check/cargo build).

Testing & Verification

• Verified that none of the removed crates are imported or used in the utility-backend codebase.
• Tests should pass on CI.