refactor(platform): restructure platform-specific abstractions and add synthetic backends

src/platform/noop.rs

@@ -0,0 +1,39 @@
+// SPDX-FileCopyrightText: 2026-Present Nils Andreas Svee mailto:contact@lochnair.net (github @Lochnair)
+//
+// SPDX-License-Identifier: MPL-2.0
+
+use crate::platform::TrafficControlBackend;
+use log::debug;
+use std::convert::Infallible;
+
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub(crate) struct NoopShaper {
+    interface: String,
+}
+
+#[derive(Debug, Default)]
+pub(crate) struct NoopTrafficControl;
+
+impl TrafficControlBackend for NoopTrafficControl {
+    type Error = Infallible;
+    type Handle = NoopShaper;
+
+    fn find_shaper(&mut self, interface: &str) -> Result<Self::Handle, Self::Error> {
+        Ok(NoopShaper {
+            interface: interface.to_string(),
+        })
+    }
+
+    fn set_rate(
+        &mut self,
+        shaper: &Self::Handle,
+        bandwidth_kbit: u64,
+        dry_run: bool,
+    ) -> Result<(), Self::Error> {
+        debug!(
+            "Ignoring traffic-control rate request of {} kbit/s for interface {} (dry_run={})",
+            bandwidth_kbit, shaper.interface, dry_run
+        );
+        Ok(())
+    }
+}