fix: trustProxies (assets Filament https) + noms exos localisés (name_i18n) + /api/stats

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

functional/exercises/src/Http/Controllers/StatsController.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace Functional\Exercises\Http\Controllers;
+
+use Illuminate\Http\JsonResponse;
+use Illuminate\Support\Facades\DB;
+
+/**
+ * Stats publiques agrégées (widget Homepage). Compteurs seulement, aucune donnée perso.
+ */
+class StatsController
+{
+    public function __invoke(): JsonResponse
+    {
+        return response()->json([
+            'exercises' => DB::table('exercises')->count(),
+            'users' => DB::table('users')->count(),
+            'workouts' => DB::table('workout_sessions')->where('status', 'completed')->count(),
+            'active_streaks' => DB::table('streaks')->where('current_count', '>', 0)->count(),
+        ]);
+    }
+}