feat(agent-metric): implémentation Phase 3 — métriques système

- Collecte temps réel (1s) : CPU, RAM, charge réseau, top 5 processus
- Collecte medium (30min) : disques via sysinfo, températures hwmon, SMART smartctl
- Collecte statique (boot) : DMI/BIOS via /sys, interfaces réseau, CPU model
- API locale Axum sur :9101 — GET /metrics (réaltime + medium + hardware)
- Push backend : /api/v1/metrics (réaltime + medium) et /api/v1/events (hardware, boot)
- Architecture modulaire : collectors/realtime, medium, static_info
- ROADMAP Phase 3 marquée complète

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

agents/agent-metric/Cargo.toml

@@ -4,10 +4,14 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
-tokio       = { workspace = true }
-serde       = { workspace = true }
-serde_json  = { workspace = true }
-anyhow      = { workspace = true }
-tracing     = { workspace = true }
+tokio              = { workspace = true }
+serde              = { workspace = true }
+serde_json         = { workspace = true }
+anyhow             = { workspace = true }
+tracing            = { workspace = true }
 tracing-subscriber = { workspace = true }
-axum        = "0.8"
+axum               = "0.8"
+serde_yaml         = "0.9"
+reqwest            = { version = "0.12", features = ["json"] }
+chrono             = { version = "0.4", features = ["serde"] }
+sysinfo            = "0.32"