refactor: move lib directory to libs for consistency

- Move src/lib/capacitor to src/libs/capacitor
- Move src/lib/fontawesome.ts to src/libs/fontawesome.ts
- Update import paths in main.capacitor.ts and main.common.ts
- Remove empty src/lib directory

This change standardizes the project structure by using the 'libs'
directory consistently throughout the codebase.

src/main.capacitor.ts

@@ -29,7 +29,7 @@
  */
 
 import { initializeApp } from "./main.common";
-import { App } from "./lib/capacitor/app";
+import { App } from "./libs/capacitor/app";
 import router from "./router";
 import { handleApiError } from "./services/api";
 import { AxiosError } from "axios";