chore: initialise la structure du projet SentinelMesh

- Workspace Cargo avec backend, agent-scan-network, agent-metric
- Skeleton Rust pour les trois crates (Axum, Tokio, SQLx)
- Documentation : README, FEATURES, ROADMAP, ARCHITECTURE, API, INSTALL
- Exemples de widgets Glance (custom-api)
- Script d'installation agents (squelette Phase 5)
- Docker Compose + Dockerfile backend
- .gitignore et CLAUDE.md

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

agents/agent-metric/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name    = "agent-metric"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+tokio       = { workspace = true }
+serde       = { workspace = true }
+serde_json  = { workspace = true }
+anyhow      = { workspace = true }
+tracing     = { workspace = true }
+tracing-subscriber = { workspace = true }
+axum        = "0.8"

agents/agent-metric/src/main.rs

@@ -0,0 +1,18 @@
+use tracing::info;
+use tracing_subscriber::EnvFilter;
+
+#[tokio::main]
+async fn main() -> anyhow::Result<()> {
+    tracing_subscriber::fmt()
+        .with_env_filter(EnvFilter::from_default_env())
+        .init();
+
+    info!("agent-metric démarré");
+
+    // TODO Phase 3 : collecte CPU/RAM/GPU/réseau (1s)
+    // TODO Phase 3 : collecte HDD/SMART/températures (30min)
+    // TODO Phase 3 : collecte DMI/hardware/BIOS (boot)
+    // TODO Phase 3 : événements système
+
+    Ok(())
+}

agents/agent-scan-network/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name    = "agent-scan-network"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+tokio       = { workspace = true }
+serde       = { workspace = true }
+serde_json  = { workspace = true }
+anyhow      = { workspace = true }
+tracing     = { workspace = true }
+tracing-subscriber = { workspace = true }
+axum        = "0.8"

agents/agent-scan-network/src/main.rs

@@ -0,0 +1,16 @@
+use tracing::info;
+use tracing_subscriber::EnvFilter;
+
+#[tokio::main]
+async fn main() -> anyhow::Result<()> {
+    tracing_subscriber::fmt()
+        .with_env_filter(EnvFilter::from_default_env())
+        .init();
+
+    info!("agent-scan-network démarré");
+
+    // TODO Phase 2 : scan ICMP, ARP, MAC/OUI, DNS, détection services
+    // TODO Phase 2 : API JSON locale + push backend
+
+    Ok(())
+}