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/database/migrations/2026_07_19_014000_add_name_i18n_to_exercises.php

@@ -0,0 +1,23 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::table('exercises', function (Blueprint $table) {
+            // Traductions du nom : { fr: "...", "pt-BR": "..." }. Anglais = colonne name (canonique).
+            $table->json('name_i18n')->nullable()->after('name');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('exercises', function (Blueprint $table) {
+            $table->dropColumn('name_i18n');
+        });
+    }
+};