feat: add fuzz crate scaffold and fuzz_parse_command target

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

lib/fuzz/.gitignore

@@ -0,0 +1,4 @@
+target/
+corpus/
+artifacts/
+Cargo.lock

lib/fuzz/Cargo.toml

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+[package]
+name = "usbip-rs-fuzz"
+version = "0.0.0"
+publish = false
+edition = "2024"
+
+[package.metadata]
+cargo-fuzz = true
+
+[dependencies]
+libfuzzer-sys = "0.4"
+tokio = { version = "1", features = ["rt-multi-thread", "sync", "time", "io-util"] }
+
+[dependencies.usbip-rs]
+path = ".."
+features = ["fuzz"]
+
+[workspace]
+members = ["."]
+
+[[bin]]
+name = "fuzz_parse_command"
+path = "fuzz_targets/fuzz_parse_command.rs"
+doc = false
+
+[[bin]]
+name = "fuzz_handle_client"
+path = "fuzz_targets/fuzz_handle_client.rs"
+doc = false
+
+[[bin]]
+name = "fuzz_urb_hid"
+path = "fuzz_targets/fuzz_urb_hid.rs"
+doc = false
+
+[[bin]]
+name = "fuzz_urb_uac"
+path = "fuzz_targets/fuzz_urb_uac.rs"
+doc = false
+
+[[bin]]
+name = "fuzz_urb_cdc"
+path = "fuzz_targets/fuzz_urb_cdc.rs"
+doc = false

lib/fuzz/fuzz_targets/fuzz_parse_command.rs

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+#![no_main]
+
+use libfuzzer_sys::fuzz_target;
+use usbip_rs::mock::MockSocket;
+use usbip_rs::usbip_protocol::UsbIpCommand;
+
+fuzz_target!(|data: &[u8]| {
+    let rt = tokio::runtime::Builder::new_current_thread()
+        .build()
+        .unwrap();
+    let mut socket = MockSocket::new(data.to_vec());
+    let _ = rt.block_on(UsbIpCommand::read_from_socket(&mut socket));
+});