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.

configs/whitelist.yaml.example

@@ -0,0 +1,14 @@
+# Linux Patch API - IP Whitelist Configuration
+# Copy to /etc/linux_patch_api/whitelist.yaml
+# Block all by default - only listed IPs can access the API
+
+# Supported entry types:
+# - Individual IPs: "192.168.1.100"
+# - CIDR subnets: "192.168.1.0/24"
+# - Hostnames: "admin-server.internal" (resolved at startup)
+
+# Example entries:
+entries:
+  - "192.168.1.0/24"      # Management network
+  - "10.0.0.50"          # Specific admin workstation
+  # - "admin-server.internal"  # Hostname example (uncomment to use)