Add cross-compilation config for aarch64

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013kj58Jugkic783b8ZrtTVZ

.cargo/config.toml

@@ -0,0 +1,4 @@
+# The services run on the Jetson (aarch64). Build for it with:
+#   cargo build --release --target aarch64-unknown-linux-gnu
+[target.aarch64-unknown-linux-gnu]
+linker = "aarch64-linux-gnu-gcc"

Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "svc-nav"
+version = "0.1.0"