refactor(xtask): read the i18n registry from i18n.rs

docs/development.md

@@ -344,7 +344,7 @@ the live command registry (`menus::is_live`) and rewrites [`docs/parity-checklis
 `parity::tests::parity_does_not_regress` fails if the live count drops below `parity::FLOOR`.
 
 `cargo xtask i18n-coverage` prints the UI translation coverage for each language in the
-`crates/ui-egui/src/i18n/mod.rs` registry, in stable language-code order. Its English-key set is
+`crates/ui-egui/src/i18n.rs` registry, in stable language-code order. Its English-key set is
 derived from UI `tl!` literals, the menu catalog and UI command table, and menu command labels in
 the engine source. Catalog rows are validated for malformed and duplicate keys; unused legacy
 translations do not affect the denominator. Unregistered locale TSV files are ignored. After the

docs/localization-zh-hans.md

@@ -27,7 +27,7 @@ language manually there.
 
 - `crates/ui-egui/src/i18n/zh-hans.tsv` contains the translations, independent of
   the lookup implementation. Its UTF-8 columns are `context<TAB>source<TAB>translation`.
-- `crates/ui-egui/src/i18n/mod.rs` registers `zh-hans` with one plural form and
+- `crates/ui-egui/src/i18n.rs` registers `zh-hans` with one plural form and
   `complete_menus: true`. `cargo xtask i18n-coverage` lists any menu string,
   `tl!` literal or other source key the catalog lacks; those show in English.
 - Shortcut templates retain `{key}` so the shell supplies the correct key for

xtask/src/i18n_coverage.rs

@@ -16,7 +16,7 @@ struct Language {
 
 pub fn run(root: &Path) -> Result<(), String> {
     let i18n_dir = root.join("crates/ui-egui/src/i18n");
-    let registry_path = i18n_dir.join("mod.rs");
+    let registry_path = root.join("crates/ui-egui/src/i18n.rs");
     let registry = fs::read_to_string(&registry_path).map_err(|e| format!("{}: {e}", registry_path.display()))?;
     let languages = registered_languages(&registry)?;
 
@@ -176,7 +176,7 @@ fn source_files(root: &Path) -> Result<Vec<(PathBuf, String)>, String> {
 fn tl_keys(sources: &[(PathBuf, String)]) -> BTreeSet<Key> {
     let mut keys = BTreeSet::new();
     for (path, source) in sources {
-        if path.ends_with("i18n/mod.rs") {
+        if path.ends_with("ui-egui/src/i18n.rs") {
             continue;
         }
         let code = before_test_module(source);
@@ -202,7 +202,7 @@ fn tl_keys(sources: &[(PathBuf, String)]) -> BTreeSet<Key> {
 fn plural_keys(sources: &[(PathBuf, String)]) -> BTreeSet<Key> {
     let mut keys = BTreeSet::new();
     for (path, source) in sources {
-        if path.ends_with("i18n/mod.rs") {
+        if path.ends_with("ui-egui/src/i18n.rs") {
             continue;
         }
         let code = before_test_module(source);