feat: portage complet en Rust (axum + sysinfo + tera)

Remplacement du backend Python/Flask par un binaire Rust natif.
Stack : axum (web), sysinfo (metriques), lettre (SMTP), tera (templates), argon2 (auth).
Binaire Windows 6.3 Mo sans dependance runtime.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Cargo.toml

@@ -0,0 +1,33 @@
+[package]
+name = "supervision"
+version = "1.0.0"
+edition = "2021"
+description = "Monitoring systeme avec interface web securisee"
+
+[[bin]]
+name = "supervision"
+path = "src/main.rs"
+
+[dependencies]
+axum = "0.7"
+tokio = { version = "1", features = ["full"] }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+tera = "1"
+sysinfo = "0.32"
+lettre = "0.11"
+argon2 = "0.5"
+password-hash = "0.5"
+tower = "0.4"
+tower-http = { version = "0.5", features = ["fs"] }
+rand = "0.8"
+chrono = { version = "0.4", features = ["serde"] }
+uuid = { version = "1", features = ["v4"] }
+form_urlencoded = "1"
+http = "1"
+
+[profile.release]
+opt-level = 3
+lto = true
+strip = true
+codegen-units = 1