fix(packaging): stop shipping frontend-contract in Linux bundles

tauri-cli's get_binaries() adds every file in src-tauri/src/bin/ as a
bundle binary, and the deb/rpm packagers copy each one to /usr/bin, so
the dev-only bindings generator ended up as /usr/bin/frontend-contract
(1.0 MB) in release packages and broke downstream repackaging (Copr:
"Installed but unpackaged file(s) found"). There is no bundler option
to exclude a binary, so move the generator to an example target, which
cargo keeps dev-only and get_binaries() never scans, and invoke it via
'cargo run --example'.

Ref https://github.com/clash-verge-rev/clash-verge-rev/pull/8131#issuecomment-6137907930

Changelog.md

@@ -6,6 +6,10 @@
 - 修复通过 URL 导入订阅时，即使导入的订阅并非当前使用的订阅，也会重新加载当前配置的问题
 - 修复「首页」网站测速失败后卡片一直显示测试中的问题
 
+**🐧 Linux**
+
+- Linux：修复 deb/rpm 安装包错误包含多余的 `frontend-contract` 可执行文件，导致下游重新打包失败的问题
+
 </details>
 
 <details>

scripts/gen-contract.mjs

@@ -22,7 +22,7 @@ try {
       'run',
       '-p',
       'clash-verge',
-      '--bin',
+      '--example',
       'frontend-contract',
       '--locked',
       '-q',

src-tauri/examples/frontend-contract.rs

@@ -1,3 +1,5 @@
+// Dev-only target: Tauri ships everything under src/bin/ to /usr/bin in deb/rpm
+// bundles (PR #8131), so this generator must stay an example, never a bin.
 fn main() -> Result<(), Box<dyn std::error::Error>> {
     let mut args = std::env::args_os().skip(1);
     let output = args