bread-onnx: fix workspace test build with load-dynamic dev-dependency

cargo test --workspace failed to link bread-onnx's own unit tests
(undefined symbol OrtGetApiBase) because nothing in this workspace
supplies an ort backend — that's deliberately left to each downstream
consumer app (breadarr, breadmill, breadpad) in their own repos. None
of bread-onnx's unit tests actually open an ONNX session, so enabling
ort's load-dynamic feature as a dev-dependency (unifies into this
crate's own test builds only, never into downstream consumers) is
enough to satisfy the linker without requiring a real onnxruntime.

bread-onnx/Cargo.toml

@@ -32,3 +32,12 @@ anyhow = { workspace = true }
 
 [dev-dependencies]
 tempfile = "3"
+# Dev-dependency features unify into this crate's own test/bench builds
+# only, never into downstream consumers (they aren't part of the dependency
+# graph a consuming app resolves) — so this doesn't compromise the
+# consumer-chooses-the-backend policy above. Without it, `cargo test` here
+# fails at link time (undefined OrtGetApiBase) because nothing in this
+# workspace supplies a backend; none of bread-onnx's own unit tests open a
+# real ONNX session, so `load-dynamic` (dlopen at runtime, no static link)
+# is enough to satisfy the linker.
+ort = { version = "2.0.0-rc.12", default-features = false, features = ["std", "tracing", "load-dynamic", "api-24"] }