feat: implement Pi Switch i18n UI and agent config switch

src/i18n/en.ts

@@ -0,0 +1,111 @@
+import type { TranslationKey } from "./zh";
+
+export const enTranslations: Record<TranslationKey, string> = {
+  // App / global
+  appTitle: "Pi Switch",
+  loading: "Loading...",
+  loadTimeout: "Loading is taking a while. Try restarting the app if it stays stuck.",
+  loadFailed: "Failed to load:",
+  retry: "Retry",
+  saveConfig: "Save Config",
+  reloadConfig: "Reload Config",
+  openConfigDir: "Open Config Dir",
+  unsavedConfirm: "You have unsaved changes. Are you sure you want to reload?",
+  providerNotFound: "Provider not found",
+  backToList: "Back to list",
+  syncToOmp: "Sync to OMP",
+  syncedToOmp: "Synced to OMP: ",
+  ompOverwriteConfirm: "OMP already has provider \"{existing}\". Replace with \"{name}\"?",
+  deleteProviderConfirm: "Delete provider {name}?",
+
+  // Provider list
+  providers: "Providers",
+  addProvider: "Add Provider",
+  noProviders: "No providers yet",
+  addFirstProvider: "Add first provider",
+  noUrl: "No URL",
+  modelCount: "{count} models",
+  ompActive: "OMP Active",
+  defaultModel: "Default: {name}",
+  edit: "Edit",
+  delete: "Delete",
+
+  // Provider edit
+  editProvider: "Edit Provider",
+  back: "Back",
+  basicInfo: "Basic Info",
+  modelMapping: "Model Mapping",
+  configJson: "Config JSON",
+  providerName: "Provider Name",
+  note: "Note",
+  notePlaceholder: "e.g. company account",
+  officialUrl: "Official URL",
+  managedProvider: "Managed provider (no credentials needed)",
+  apiSettings: "API Settings",
+  apiFormat: "API Format",
+  authField: "Auth Field",
+  apiKey: "API Key",
+  show: "Show",
+  hide: "Hide",
+  requestUrl: "Request URL",
+  fullUrl: "Full URL",
+  baseUrlHint: "Enter a {type} API-compatible endpoint without a trailing slash.",
+  envPairs: "Env pairs",
+  addEnv: "+ Add",
+  modelMappingDesc: "Display name only affects the /model menu; 1M declares context capability for Kimi Code.",
+  oneClickSetup: "One-click setup",
+  fetchModels: "Fetch models",
+  fetchingModels: "Fetching...",
+  discoveredModels: "Discovered {count} models",
+  addSelected: "Add selected",
+  modelRole: "Model role",
+  displayName: "Display name",
+  actualModel: "Actual model",
+  contextSize: "Context size",
+  supports1M: "Supports 1M",
+  default: "Default",
+  operation: "Operation",
+  isDefault: "Default",
+  setDefault: "Set default",
+  deleteModelConfirm: "Delete model {alias}?",
+  noModelMappings: "No model mappings",
+  addModelMapping: "+ Add model mapping",
+  readOnlyPreview: "Editable JSON",
+  apply: "Apply",
+  invalidJson: "Invalid JSON: {message}",
+
+  // Agent / target
+  target: "Target",
+  targetKimi: "Kimi Code",
+  targetOmp: "OMP",
+  targetQwen: "Qwen Code",
+  agent: "Agent",
+  agentKimiCode: "Kimi Code",
+  agentPi: "Pi",
+  activate: "Activate",
+  activated: "Activated",
+  disabled: "Disabled",
+  unsavedChanges: "Unsaved changes",
+  qwenActivateNotImplemented: "Qwen Code activation will be implemented in a follow-up.",
+  importConfig: "Import current config",
+  importConfigConfirm: "Importing will overwrite unsaved changes. Continue?",
+  importConfigFailed: "Import failed: {message}",
+  capabilities: "Capabilities",
+
+  // Languages
+  language: "Language",
+  zh: "中文",
+  en: "English",
+
+  // Validation errors
+  emptyProviderName: "Provider name is empty",
+  duplicateProviderName: "Duplicate provider name: {0}",
+  missingCredentials: "Provider '{0}' is missing credentials (api_key or env key)",
+  ambiguousCredentials: "Provider '{0}' has both direct and env credentials; only one source is allowed",
+  missingVertexProject: "Vertex provider '{0}' is missing GOOGLE_CLOUD_PROJECT or GOOGLE_CLOUD_LOCATION",
+  emptyModelAlias: "Model alias is empty",
+  duplicateModelAlias: "Duplicate model alias: {0}",
+  unknownModelProvider: "Model '{0}' references unknown provider '{1}'",
+  emptyModelId: "Model '{0}' has an empty model ID",
+  invalidMaxContextSize: "Model '{0}' has an invalid max_context_size",
+};