♻️ refactor: unify web app patterns across monorepo

- Rename authStore.svelte.ts to auth.svelte.ts (manacore, manadeck, moodlit)
- Add i18n setup to Finance and Mail apps (DE, EN, FR, ES, IT)
- Add feedback pages using shared component to Finance and Mail
- Create @manacore/shared-api-client package with API client factory
- Create @manacore/shared-vite-config package with SSR config helpers
- Create @manacore/shared-stores package with toast, navigation, theme factories

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

packages/shared-api-client/src/index.ts

@@ -0,0 +1,7 @@
+/**
+ * Shared API Client for ManaCore Apps
+ * Provides a unified way to make API calls with authentication.
+ */
+
+export { createApiClient, type ApiClientConfig, type ApiClient } from './client';
+export { type ApiResponse, type FetchOptions, type HttpMethod } from './types';