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/config/mod.rs

@@ -0,0 +1,10 @@
+//! Configuration Module - YAML config with auto-reload
+//!
+//! Handles configuration management as defined in SPEC.md:
+//! - YAML config file loading and parsing
+//! - Config validation before reload (prevent service offline)
+//! - Auto-reload on file change via notify watcher
+
+pub mod loader;
+pub mod validator;
+pub mod watcher;