refactor(core): default gateway config

[elezar]

Summary

Add a Default implementation for the programmatic gateway Config so no-TLS default construction can use the standard Rust trait. Update existing no-TLS test/setup call sites from Config::new(None) to Config::default().

Related Issue

N/A

Changes

• Added impl Default for Config delegating to Config::new(None).
• Updated core and server test/support call sites to use Config::default() where they want the standard gateway defaults.

Testing

• /home/elezar/.cargo/bin/cargo fmt
• /home/elezar/.cargo/bin/cargo test -p openshell-core config::tests:: --lib passes
• /home/elezar/.cargo/bin/cargo test -p openshell-server configured_compute_driver --lib attempted, blocked by local z3-sys/z3.h header availability
• /home/elezar/.cargo/bin/cargo test -p openshell-server grpc_rate_limit --lib attempted, blocked by local z3-sys/z3.h header availability
• /home/elezar/.cargo/bin/cargo test -p openshell-server configured_compute_driver --lib --features bundled-z3 attempted, blocked by bindgen missing local C header stdbool.h
• /home/elezar/.cargo/bin/cargo test -p openshell-server grpc_rate_limit --lib --features bundled-z3 attempted, blocked by bindgen missing local C header stdbool.h
• E2E tests added/updated (not applicable)

Checklist

• Follows Conventional Commits
• Commits are signed off (DCO)

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