feat(node): implement Morph node module integration

[panos-xyz]

Background

We need to complete the crates/node module so Morph-specific components are fully wired into the reth node builder pipeline.

Goal

Implement and stabilize the Morph node module, including service wiring, RPC integration, and runtime startup path.

Scope

• Finalize crates/node/src/node.rs architecture and builder flow
• Wire Morph-specific primitives / chain spec / EVM config into node components
• Integrate txpool / payload / engine-api dependencies in node startup
• Ensure RPC module is correctly registered from node side
• Verify lifecycle: init -> startup -> shutdown
• Add/complete tests for node module integration

Acceptance Criteria

• cargo check --workspace passes
• cargo test -p morph-node (or relevant node crate tests) passes
• Node starts successfully with Morph config and exposes expected RPC endpoints
• No regressions in existing Morph execution flow

Notes

• Keep implementation aligned with reth trait/generic patterns (SDK-style integration, avoid forking reth internals).
• Prefer composition and explicit wiring between Morph crates.