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>

backend/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name    = "sentinelmesh-backend"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+axum             = "0.8"
+tokio            = { workspace = true }
+serde            = { workspace = true }
+serde_json       = { workspace = true }
+anyhow           = { workspace = true }
+tracing          = { workspace = true }
+tracing-subscriber = { workspace = true }
+sqlx             = { version = "0.8", features = ["sqlite", "runtime-tokio", "macros", "migrate"] }
+tower-http       = { version = "0.6", features = ["cors", "trace"] }
+utoipa           = { version = "4", features = ["axum_extras"] }
+utoipa-swagger-ui = { version = "7", features = ["axum"] }

backend/Dockerfile

@@ -0,0 +1,13 @@
+FROM rust:1.82-alpine AS builder
+RUN apk add --no-cache musl-dev
+WORKDIR /app
+COPY Cargo.toml Cargo.lock* ./
+COPY src ./src
+RUN cargo build --release
+
+FROM alpine:3.21
+RUN apk add --no-cache ca-certificates
+WORKDIR /app
+COPY --from=builder /app/target/release/sentinelmesh-backend .
+EXPOSE 8080
+CMD ["./sentinelmesh-backend"]

backend/src/main.rs

@@ -0,0 +1,24 @@
+use axum::{routing::get, Router};
+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();
+
+    let app = Router::new().route("/api/v1/health", get(health));
+
+    let addr = "0.0.0.0:8080";
+    info!("SentinelMesh backend démarré sur {addr}");
+
+    let listener = tokio::net::TcpListener::bind(addr).await?;
+    axum::serve(listener, app).await?;
+
+    Ok(())
+}
+
+async fn health() -> &'static str {
+    "ok"
+}