Add NPC database table with server-side DataTable and per-NPC game notes

- Npc entity (village spreadsheet columns) + game_notes text field for
  the DM's live play notes, plus updated_at touched on every change
- Race / VillageStatus / BloodCartInvolvement / MysteryImportance as
  string-backed PHP enums, rendered as dropdowns on the edit form
- /npcs: server-side DataTables (paging, global search and column sort
  all run in the backend via NpcRepository::findForDataTable); name cell
  links to the edit page, game notes shown truncated
- /npcs/{id}: Bootstrap-themed edit form (all fields + a large game
  notes textarea); Symfony forms now use the bootstrap_5 theme
- app.js: generic server-side DataTable wiring driven by data-* on the
  <table>/<th> (data-datatable-src, data-row-url, data-format)
- app:npc:import console command - upserts from data/npcs.csv by
  (family, name), never overwrites game_notes; --purge / --dry-run
- data/npcs.csv: 180 villagers exported from the working spreadsheet

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

src/Enum/BloodCartInvolvement.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace App\Enum;
+
+enum BloodCartInvolvement: string
+{
+    case None = 'None';
+    case Donor = 'Donor';
+    case OccasionalDonor = 'Occasional donor';
+    case BloodCollector = 'Blood collector';
+    case BloodCartDriver = 'Blood-cart driver';
+    case CouncilOversight = 'Council oversight';
+
+    public function label(): string
+    {
+        return $this->value;
+    }
+}

src/Enum/MysteryImportance.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace App\Enum;
+
+enum MysteryImportance: string
+{
+    case Low = 'Low';
+    case Medium = 'Medium';
+    case High = 'High';
+    case Critical = 'Critical';
+
+    public function label(): string
+    {
+        return $this->value;
+    }
+}

src/Enum/Race.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace App\Enum;
+
+enum Race: string
+{
+    case Human = 'Human';
+    case Dwarf = 'Dwarf';
+    case Elf = 'Elf';
+    case HalfElf = 'Half-Elf';
+    case Halfling = 'Halfling';
+    case Gnome = 'Gnome';
+    case HalfOrc = 'Half-Orc';
+    case Tiefling = 'Tiefling';
+    case Dragonborn = 'Dragonborn';
+    case Other = 'Other';
+
+    public function label(): string
+    {
+        return $this->value;
+    }
+}

src/Enum/VillageStatus.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace App\Enum;
+
+enum VillageStatus: string
+{
+    case Established = 'Established villager';
+    case Young = 'Young villager';
+    case Adopted = 'Adopted villager';
+    case NewlyEligibleDonor = 'Newly eligible donor';
+
+    public function label(): string
+    {
+        return $this->value;
+    }
+}