fix: address final review findings — nerve consume ordering, character init, seeder costs, dead column

- Consume nerve before energy in CrimeService so energy is never lost when nerve is insufficient
- Initialize nerve/max_nerve from config in CharacterController::store (same pattern as energy/health)
- Add nerve_cost to all CrimeSeeder entries proportional to difficulty (1-5 range)
- Remove nerve_regen_at from Character $fillable/$casts/@property — column exists but is not yet wired up

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/Models/Character.php

@@ -21,7 +21,6 @@ use Illuminate\Database\Eloquent\Relations\HasMany;
  * @property int $max_energy
  * @property int $nerve
  * @property int $max_nerve
- * @property \Illuminate\Support\Carbon|null $nerve_regen_at
  * @property int $health
  * @property int $max_health
  * @property int $strength
@@ -53,7 +52,6 @@ class Character extends Model
         'max_energy',
         'nerve',
         'max_nerve',
-        'nerve_regen_at',
         'health',
         'max_health',
         'strength',
@@ -72,7 +70,6 @@ class Character extends Model
         'in_hospital_until' => 'datetime',
         'in_jail_until' => 'datetime',
         'last_action_at' => 'datetime',
-        'nerve_regen_at' => 'datetime',
         'status' => CharacterStatus::class,
     ];