feat: add SocialAccount model, migration, and factory

Implement SocialAccount model with enum fields for network and type,
along with migration and factory. Includes NETWORKS and TYPES constants
for dropdown usage in Livewire forms and validation.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

database/migrations/2026_07_18_114858_create_social_accounts_table.php

@@ -0,0 +1,32 @@
+<?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::create('social_accounts', function (Blueprint $table) {
+            $table->id();
+            $table->enum('network', [
+                'twitter', 'instagram', 'facebook', 'reddit',
+                'tiktok', 'linkedin', 'youtube', 'other',
+            ]);
+            $table->string('username');
+            $table->string('email');
+            $table->string('password');
+            $table->enum('type', ['post', 'comment', 'like'])->nullable();
+            $table->timestamps();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('social_accounts');
+    }
+};