Update: 将子项目从 submodule 转为完整内容

- 移除 GovAI, nomifun-tauri, 算力盒子 的 submodule 引用
- 添加所有子项目的完整源代码
- 保留原始 .git 为 .git.bak 备份

nomifun-tauri/crates/backend/nomifun-common/build.rs

@@ -0,0 +1,9 @@
+fn main() {
+    // `channel::channel()` bakes `NOMI_CHANNEL` into this crate via
+    // `option_env!`. Cargo does not track env vars read by `option_env!`, so
+    // without this a channel switch (stable ⇄ dev) would NOT recompile and the
+    // old channel would persist until a manual `cargo clean`. Telling cargo to
+    // rerun this build script when the var changes marks the crate dirty and
+    // forces the recompile that picks up the new channel.
+    println!("cargo:rerun-if-env-changed=NOMI_CHANNEL");
+}