refactor(types): rename AppType to AppId for semantic clarity

Rename `AppType` to `AppId` across the entire frontend codebase to better
reflect its purpose as an application identifier rather than a type category.
This aligns frontend naming with backend command parameter conventions.

Changes:
- Rename type `AppType` to `AppId` in src/lib/api/types.ts
- Remove `AppType` export from src/lib/api/index.ts
- Update all component props from `appType` to `appId` (43 files)
- Update all variable names from `appType` to `appId`
- Synchronize documentation (CHANGELOG, refactoring plans)
- Update test files and MSW mocks

BREAKING CHANGE: `AppType` type is no longer exported. Use `AppId` instead.
All component props have been renamed from `appType` to `appId`.

src/hooks/useProviderActions.ts

@@ -2,7 +2,7 @@ import { useCallback } from "react";
 import { useQueryClient } from "@tanstack/react-query";
 import { toast } from "sonner";
 import { useTranslation } from "react-i18next";
-import { providersApi, settingsApi, type AppType } from "@/lib/api";
+import { providersApi, settingsApi, type AppId } from "@/lib/api";
 import type { Provider, UsageScript } from "@/types";
 import {
   useAddProviderMutation,
@@ -16,7 +16,7 @@ import { extractErrorMessage } from "@/utils/errorUtils";
  * Hook for managing provider actions (add, update, delete, switch)
  * Extracts business logic from App.tsx
  */
-export function useProviderActions(activeApp: AppType) {
+export function useProviderActions(activeApp: AppId) {
   const { t } = useTranslation();
   const queryClient = useQueryClient();