WP-00: project skeleton with three-level test harness

Cargo workspace (domain, application, infrastructure, api), axum health endpoint
with SPA fallback, Vue 3 + Tailwind frontend, Vitest, Playwright, Makefile,
Gitea Actions CI and README.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

backend/crates/api/Cargo.toml

@@ -0,0 +1,34 @@
+[package]
+name = "api"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+
+[[bin]]
+name = "monitoring-server"
+path = "src/main.rs"
+
+[dependencies]
+domain.workspace = true
+application.workspace = true
+infrastructure.workspace = true
+anyhow.workspace = true
+axum.workspace = true
+chrono.workspace = true
+dotenvy.workspace = true
+serde.workspace = true
+serde_json.workspace = true
+sqlx.workspace = true
+tokio.workspace = true
+tower-http.workspace = true
+tracing.workspace = true
+tracing-subscriber.workspace = true
+utoipa.workspace = true
+uuid.workspace = true
+
+[dev-dependencies]
+http-body-util.workspace = true
+tower.workspace = true
+
+[lints]
+workspace = true