feat: add nerve and gym_sessions migrations

database/migrations/2026_06_28_000001_add_nerve_to_characters_table.php

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+<?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('characters', function (Blueprint $table) {
+            $table->integer('nerve')->default(100)->after('max_energy');
+            $table->integer('max_nerve')->default(100)->after('nerve');
+            $table->timestamp('nerve_regen_at')->nullable()->after('max_nerve');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('characters', function (Blueprint $table) {
+            $table->dropColumn(['nerve', 'max_nerve', 'nerve_regen_at']);
+        });
+    }
+};

database/migrations/2026_06_28_000002_add_nerve_cost_to_crimes_table.php

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+<?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('crimes', function (Blueprint $table) {
+            $table->integer('nerve_cost')->default(1)->after('energy_cost');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('crimes', function (Blueprint $table) {
+            $table->dropColumn('nerve_cost');
+        });
+    }
+};

database/migrations/2026_06_28_000003_add_nerve_cost_to_crime_attempts_table.php

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+<?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('crime_attempts', function (Blueprint $table) {
+            $table->integer('nerve_cost')->default(1)->after('experience_gained');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('crime_attempts', function (Blueprint $table) {
+            $table->dropColumn('nerve_cost');
+        });
+    }
+};

database/migrations/2026_06_28_000004_create_gym_sessions_table.php

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+<?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::create('gym_sessions', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('character_id')->constrained()->cascadeOnDelete();
+            $table->enum('stat', ['strength', 'defense', 'speed', 'dexterity']);
+            $table->integer('sessions_today')->default(0);
+            $table->date('reset_date');
+            $table->timestamps();
+
+            $table->unique(['character_id', 'stat']);
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('gym_sessions');
+    }
+};