Phase 0: Rust project scaffolding (M0 complete)

Completed Rust project initialization:
- Cargo.toml with all dependencies (actix-web, tokio, rustls, etc.)
- Project structure (src/, tests/, configs/)
- Module declarations (api, auth, config, jobs, logging, packages, systemd)
- Clippy and rustfmt configured
- Initial lib.rs and main.rs with logging setup
- Config examples (config.yaml.example, whitelist.yaml.example)

Dependencies resolved and project compiles successfully.
Rust toolchain 1.94.1 installed.

src/auth/mod.rs

@@ -0,0 +1,10 @@
+//! Authentication Module - mTLS and IP Whitelist
+//!
+//! Handles mTLS certificate validation and IP whitelist enforcement:
+//! - Certificate validation against internal CA
+//! - IP whitelist checking (IPv4 + CIDR + hostname)
+//! - Client identity extraction from certificates
+
+pub mod certificate;
+pub mod ip_whitelist;
+pub mod middleware;