chore: cargo workspace skeleton

Eleven empty crates per DESIGN.md §11, versions and lints pinned once in the
root manifest, Justfile carrying the §12 gate, nix dev shell.

The frontend steps in `just ci` no-op until web/ exists. arr-core carries one
placeholder test because `cargo nextest` fails a zero-test run, and relaxing
that would let a broken filter go green later.

Closes #1

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Cargo.toml

@@ -0,0 +1,69 @@
+[workspace]
+resolver = "2"
+members = ["crates/*"]
+
+[workspace.package]
+version = "0.1.0"
+edition = "2021"
+license = "MIT"
+repository = "https://git.naps.pt/yolo/arr"
+publish = false
+
+[workspace.dependencies]
+# Internal
+arr-api = { path = "crates/arr-api" }
+arr-compat = { path = "crates/arr-compat" }
+arr-core = { path = "crates/arr-core" }
+arr-db = { path = "crates/arr-db" }
+arr-dl = { path = "crates/arr-dl" }
+arr-indexer = { path = "crates/arr-indexer" }
+arr-meta = { path = "crates/arr-meta" }
+arr-parse = { path = "crates/arr-parse" }
+arr-probe = { path = "crates/arr-probe" }
+
+# Runtime and HTTP
+axum = "0.8"
+tokio = { version = "1", features = ["macros", "rt-multi-thread", "sync", "time", "net", "io-util", "fs", "signal", "process"] }
+tower-http = { version = "0.6", features = ["trace"] }
+reqwest = { version = "0.12", default-features = false, features = ["json", "rustls-tls"] }
+
+# Persistence
+sqlx = { version = "0.8", default-features = false, features = ["runtime-tokio", "sqlite", "macros", "migrate", "chrono", "json"] }
+
+# API surface
+utoipa = { version = "5", features = ["axum_extras", "chrono"] }
+utoipa-axum = "0.2"
+utoipa-scalar = { version = "0.3", features = ["axum"] }
+
+# Embedded frontend
+include_dir = "0.7"
+mime_guess = "2"
+
+# Serialisation
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+quick-xml = { version = "0.37", features = ["serialize"] }
+toml = "0.8"
+
+# Odds and ends
+chrono = { version = "0.4", default-features = false, features = ["clock", "serde"] }
+clap = { version = "4.5", features = ["derive", "env"] }
+thiserror = "2"
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }
+uuid = { version = "1", features = ["v4", "serde"] }
+
+# Test-only
+wiremock = "0.6"
+
+[workspace.lints.rust]
+unused_crate_dependencies = "warn"
+missing_debug_implementations = "warn"
+
+[workspace.lints.clippy]
+pedantic = { level = "warn", priority = -1 }
+unwrap_used = "warn"
+
+[profile.release]
+lto = "thin"
+codegen-units = 1