Add Enemies section: D&D stat-block table + detail/edit pages

- Enemy entity: full 5e stat block (size/type/subtype/alignment, AC, HP,
  speed, six ability scores, CR/XP/prof, saves/skills/senses/languages,
  damage & condition modifiers, traits/actions/bonus/reactions/legendary,
  description, source) plus a DM game-notes field and updated_at.
- CreatureSize / CreatureType enums.
- /enemies: server-side DataTable (name, size, type, CR, AC, HP, notes),
  "Add enemy" button.
- /enemies/{id}: stat block rendered read-only + editable game notes.
- /enemies/new and /enemies/{id}/edit: the full stat-block form (no notes).
- "Enemies" nav item between NPC's and Storyline.
- Table left empty on purpose.

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

src/Enum/CreatureSize.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace App\Enum;
+
+enum CreatureSize: string
+{
+    case Tiny = 'Tiny';
+    case Small = 'Small';
+    case Medium = 'Medium';
+    case Large = 'Large';
+    case Huge = 'Huge';
+    case Gargantuan = 'Gargantuan';
+
+    public function label(): string
+    {
+        return $this->value;
+    }
+}

src/Enum/CreatureType.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace App\Enum;
+
+enum CreatureType: string
+{
+    case Aberration = 'Aberration';
+    case Beast = 'Beast';
+    case Celestial = 'Celestial';
+    case Construct = 'Construct';
+    case Dragon = 'Dragon';
+    case Elemental = 'Elemental';
+    case Fey = 'Fey';
+    case Fiend = 'Fiend';
+    case Giant = 'Giant';
+    case Humanoid = 'Humanoid';
+    case Monstrosity = 'Monstrosity';
+    case Ooze = 'Ooze';
+    case Plant = 'Plant';
+    case Undead = 'Undead';
+
+    public function label(): string
+    {
+        return $this->value;
+    }
+}