feat(cross-compile): add cross-compilation support with --target flag, friendly target aliases, and automatic rustup target installation

readme.md

@@ -83,6 +83,42 @@ Run `cargo clean` before building to force a full rebuild:
 tsrust --clean
 ```
 
+### Cross-Compilation
+
+Cross-compile for different OS/architecture combinations using the `--target` flag:
+
+```bash
+# Cross-compile for a single target
+tsrust --target linux_arm64
+
+# Cross-compile for multiple targets
+tsrust --target linux_arm64 --target linux_amd64
+
+# Full Rust triples are also accepted
+tsrust --target aarch64-unknown-linux-gnu
+```
+
+Supported friendly target names:
+
+| Friendly name | Rust target triple |
+|---|---|
+| `linux_amd64` | `x86_64-unknown-linux-gnu` |
+| `linux_arm64` | `aarch64-unknown-linux-gnu` |
+| `linux_amd64_musl` | `x86_64-unknown-linux-musl` |
+| `linux_arm64_musl` | `aarch64-unknown-linux-musl` |
+| `macos_amd64` | `x86_64-apple-darwin` |
+| `macos_arm64` | `aarch64-apple-darwin` |
+
+When using `--target`, output binaries are named `<binname>_<os>_<arch>`:
+
+```
+dist_rust/
+├── rustproxy_linux_arm64
+└── rustproxy_linux_amd64
+```
+
+`tsrust` automatically installs missing rustup targets via `rustup target add` when needed.
+
 ### 🗑️ Clean Only
 
 Remove all build artifacts without rebuilding: