Refactor dashboard and upload flows

Remove dead admin UI code, redesign dashboard followers/following and upload experiences, and add schema audit tooling with repair migrations for forum and upload drift.

app/Http/Controllers/Web/StaffApplicationAdminController.php

@@ -1,21 +0,0 @@
-<?php
-
-namespace App\Http\Controllers\Web;
-
-use App\Http\Controllers\Controller;
-use App\Models\StaffApplication;
-use Illuminate\Http\Request;
-
-class StaffApplicationAdminController extends Controller
-{
-    public function index(Request $request)
-    {
-        $items = StaffApplication::orderBy('created_at', 'desc')->paginate(25);
-        return view('admin.staff_applications.index', ['items' => $items]);
-    }
-
-    public function show(StaffApplication $staffApplication)
-    {
-        return view('admin.staff_applications.show', ['item' => $staffApplication]);
-    }
-}