feat(coprocessor): add healthcheck to tx-sender

[tawadaa]

No description provided.

[Copilot]

Pull Request Overview

Adds a health-check endpoint and underlying logic to the transaction-sender service, moves configuration into its own module, and updates dependencies to support HTTP routing.

• Introduces HealthStatus and a health_check method on TransactionSender
• Adds an Axum-based HTTP server with /healthz and /liveness routes
• Extracts ConfigSettings into config.rs and bumps the crate version, adding new dependencies

Reviewed Changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
transaction_sender.rs	Implemented health_check and imported HealthStatus
ops/mod.rs	Extended Op trait with check_provider_connection
lib.rs & config.rs	Extracted ConfigSettings; added HealthStatus
http_server.rs	New HTTP server exposing health and liveness endpoints
Cargo.toml	Bumped version; added Axum, Tower, Serde deps

Comments suppressed due to low confidence (3)

coprocessor/fhevm-engine/transaction-sender/src/http_server.rs:21

• [nitpick] The status_code field is a String; consider using an integer type (e.g., u16) to better align with HTTP status codes and reduce parsing overhead.

status_code: String,

coprocessor/fhevm-engine/transaction-sender/src/transaction_sender.rs:174

• Add more detailed doc comments describing what downstream errors or partial failures are captured by health_check, and how callers should interpret HealthStatus.details.

/// Checks the health of the transaction sender's connections

coprocessor/fhevm-engine/transaction-sender/src/transaction_sender.rs:175

• There are no unit tests covering the new health_check logic; consider adding tests that simulate healthy/unhealthy database and blockchain scenarios.

pub async fn health_check(&self) -> HealthStatus {

[antoniupop]

LGTM!