Add Thai language support for various application components

- Introduced Thai translations for dashboard, knowledge, login, models, scripts, settings, skills, task, and common UI elements.
- Updated provider placeholders to include Thai language options.
- Modified locale resolution to support Thai language.
- Adjusted settings store to handle legacy language migration from Japanese to Thai.
- Enhanced runtime types to include Thai as a supported language.

src/stores/settings.ts

@@ -82,6 +82,10 @@ function createInitialState(): SettingsState {
 
 let state: SettingsState = createInitialState();
 
+function migrateLegacyLanguageCode(language: string | null | undefined): string | null | undefined {
+  return language === 'ja' ? 'th' : language;
+}
+
 function emit(): void {
   for (const listener of listeners) {
     listener();
@@ -219,7 +223,7 @@ async function hydrate(): Promise<SettingsState> {
       readConfigValue<boolean>(CONFIG_KEYS.GATEWAY_AUTO_START, true),
     ]);
 
-    const resolvedLanguage = resolveSupportedLanguage(language ?? systemLanguage);
+    const resolvedLanguage = resolveSupportedLanguage(migrateLegacyLanguageCode(language) ?? systemLanguage);
     const appliedTheme = applyTheme(themeMode, systemTheme);
 
     patchState({
@@ -265,7 +269,7 @@ async function setThemeMode(themeMode: ThemeMode): Promise<SettingsState> {
 }
 
 async function setLanguage(language: string | null | undefined, persist = true): Promise<SettingsState> {
-  const resolved = resolveSupportedLanguage(language, state.language);
+  const resolved = resolveSupportedLanguage(migrateLegacyLanguageCode(language), state.language);
   if (state.language === resolved && state.initialized) return state;
 
   applyLocale(resolved);