feat(profile): add uploadable avatars with local/S3 storage

Users can upload and remove profile pictures on the profile page.
Admins choose local or instance S3 storage in advanced settings.
Avatars are compressed to JPEG and served via a private cached route.

database/migrations/2026_08_07_185535_add_avatar_columns_to_users_table.php

@@ -0,0 +1,31 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::table('users', function (Blueprint $table) {
+            $table->string('avatar_path')->nullable();
+            $table->string('avatar_storage_type')->nullable();
+            $table->foreignId('avatar_s3_storage_id')->nullable()->constrained('s3_storages')->nullOnDelete();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('users', function (Blueprint $table) {
+            $table->dropConstrainedForeignId('avatar_s3_storage_id');
+            $table->dropColumn(['avatar_path', 'avatar_storage_type']);
+        });
+    }
+};

database/migrations/2026_08_07_185535_add_avatar_storage_settings_to_instance_settings_table.php

@@ -0,0 +1,30 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::table('instance_settings', function (Blueprint $table) {
+            $table->string('avatar_storage_type')->default('local');
+            $table->foreignId('avatar_s3_storage_id')->nullable()->constrained('s3_storages')->nullOnDelete();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('instance_settings', function (Blueprint $table) {
+            $table->dropConstrainedForeignId('avatar_s3_storage_id');
+            $table->dropColumn('avatar_storage_type');
+        });
+    }
+};