Initial GameLog setup

- Laravel 11 + Breeze (dark mode) + Tailwind + Alpine.js
- Migrations: games, genres, platforms, companies, pivots,
  user_games, user_lists, reviews, follows, activities
- Models: Game, Genre, Platform, Company, UserGame, UserList,
  Review, ReviewVote, Activity, User (with gamelog fields)
- IgdbService: OAuth2 token management, search, game fetch,
  popular/new releases, genre filter, cover/screenshot URL helpers
- IGDB credentials in config/services.php (from .env)

app/Models/Activity.php

@@ -0,0 +1,24 @@
+<?php
+namespace App\Models;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class Activity extends Model
+{
+    protected $fillable = ['user_id','type','subject_type','subject_id','data'];
+    protected $casts = ['data'=>'array'];
+
+    public function user(): BelongsTo { return $this->belongsTo(User::class); }
+    public function subject() { return $this->morphTo(); }
+
+    public static function log(int $userId, string $type, mixed $subject = null, array $data = []): self
+    {
+        return static::create([
+            'user_id'      => $userId,
+            'type'         => $type,
+            'subject_type' => $subject ? get_class($subject) : null,
+            'subject_id'   => $subject?->id,
+            'data'         => $data,
+        ]);
+    }
+}