feat(M1): Project scaffolding, DB schema, core infrastructure

- Initialize Rust workspace with 7 crates (pm-web, pm-worker, pm-core,
  pm-agent-client, pm-auth, pm-ca, pm-reports)
- React + TypeScript + Vite + MUI frontend scaffold
- Full PostgreSQL schema: all 17 tables with indexes and constraints
- pm-core: config (TOML+env), db (SQLx pool + migrations), error
  (unified AppError + JSON envelope), request_id (ULID middleware),
  logging (tracing JSON/pretty)
- pm-web: Axum skeleton, /status/health endpoint, static file serving
- pm-worker: Tokio skeleton, heartbeat writer, schema version check
- Embedded sqlx migrations with advisory lock (single-writer)
- systemd unit files, setup.sh, build-frontend.sh
- config.example.toml with all configuration keys
- docs/runbooks/restore.md
- cargo check passes with zero warnings

Closes M1.

crates/pm-web/src/main.rs

@@ -0,0 +1,137 @@
+//! pm-web — Linux Patch Manager web server.
+//!
+//! Serves the React SPA, exposes the REST API, and handles WebSocket relay.
+
+use axum::{
+    extract::State,
+    http::StatusCode,
+    middleware,
+    response::Json,
+    routing::get,
+    Router,
+};
+use pm_core::{
+    config::AppConfig,
+    db,
+    logging,
+    request_id::request_id_middleware,
+};
+use serde_json::{json, Value};
+use std::{net::SocketAddr, sync::Arc};
+use tower_http::{
+    services::ServeDir,
+    trace::TraceLayer,
+};
+
+/// Shared application state threaded through Axum.
+#[derive(Clone)]
+pub struct AppState {
+    pub db: sqlx::PgPool,
+    pub config: Arc<AppConfig>,
+}
+
+#[tokio::main]
+async fn main() -> anyhow::Result<()> {
+    // Load configuration
+    let config_path = std::env::var("PATCH_MANAGER_CONFIG")
+        .unwrap_or_else(|_| "/etc/patch-manager/config.toml".to_string());
+
+    let config = AppConfig::load(&config_path)
+        .unwrap_or_else(|_| {
+            eprintln!("Config file not found or invalid, using defaults");
+            AppConfig::default()
+        });
+
+    // Initialize logging
+    logging::init(&config.logging);
+
+    tracing::info!(version = env!("CARGO_PKG_VERSION"), "patch-manager-web starting");
+
+    // Initialize database pool
+    let pool = db::init_pool(&config.database).await?;
+
+    // Run migrations (advisory lock guards single-writer)
+    db::run_migrations(&pool).await?;
+
+    let state = AppState {
+        db: pool,
+        config: Arc::new(config.clone()),
+    };
+
+    // Build the application router
+    let app = build_router(state);
+
+    // Bind address
+    let addr: SocketAddr = format!("{}:{}", config.server.host, config.server.port)
+        .parse()
+        .expect("Invalid bind address");
+
+    tracing::info!(%addr, "Listening");
+
+    // TODO M8: wrap with TLS (rustls). For M1 we bind plain HTTP for local dev.
+    let listener = tokio::net::TcpListener::bind(addr).await?;
+    axum::serve(listener, app).await?;
+
+    Ok(())
+}
+
+/// Construct the full Axum router.
+pub fn build_router(state: AppState) -> Router {
+    let static_dir = state.config.server.static_dir.clone();
+
+    Router::new()
+        // Health / status (unauthenticated)
+        .route("/status/health", get(health_handler))
+        // API v1 routes (stub — expanded in later milestones)
+        .nest("/api/v1", api_v1_router())
+        // Serve React SPA static files; fallback to index.html for client-side routing
+        .fallback_service(
+            ServeDir::new(&static_dir)
+                .append_index_html_on_directories(true),
+        )
+        // Middleware stack
+        .layer(middleware::from_fn(request_id_middleware))
+        .layer(TraceLayer::new_for_http())
+        .with_state(state)
+}
+
+/// API v1 sub-router — routes added per milestone.
+fn api_v1_router() -> Router<AppState> {
+    Router::new()
+        // M2+: auth routes will be nested here
+        // M3+: host/group/user routes
+        // M4+: fleet status, agent polling
+        // M5+: jobs
+        // M6+: maintenance windows
+        // M7+: websocket relay
+        // M8+: certificates
+        // M9+: reports
+        // M10+: settings
+}
+
+/// GET /status/health — liveness probe.
+///
+/// Returns 200 OK with a JSON payload including service name, version,
+/// and basic database reachability.
+async fn health_handler(State(state): State<AppState>) -> Result<Json<Value>, StatusCode> {
+    // Quick DB ping
+    let db_ok = sqlx::query("SELECT 1")
+        .execute(&state.db)
+        .await
+        .is_ok();
+
+    let status = if db_ok { "healthy" } else { "degraded" };
+
+    let body = json!({
+        "service": "patch-manager-web",
+        "version": env!("CARGO_PKG_VERSION"),
+        "status": status,
+        "database": if db_ok { "ok" } else { "error" },
+    });
+
+    if db_ok {
+        Ok(Json(body))
+    } else {
+        Err(StatusCode::SERVICE_UNAVAILABLE)
+    }
+}