Add naming scheme selection to run configuration

Add a nullable naming_scheme column to NuzlockeRun so users can pick a
themed word category for nickname suggestions. Includes Alembic migration,
updated Pydantic schemas, a GET /runs/naming-categories endpoint backed by
a cached dictionary loader, and frontend dropdowns in both the NewRun
creation flow and the RunDashboard for mid-run changes.

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

frontend/src/pages/RunDashboard.tsx

@@ -1,6 +1,6 @@
 import { useMemo, useState } from 'react'
 import { useParams, Link } from 'react-router-dom'
-import { useRun, useUpdateRun } from '../hooks/useRuns'
+import { useRun, useUpdateRun, useNamingCategories } from '../hooks/useRuns'
 import { useGameRoutes } from '../hooks/useGames'
 import { useCreateEncounter, useUpdateEncounter } from '../hooks/useEncounters'
 import { StatCard, PokemonCard, RuleBadges, StatusChangeModal, EndRunModal } from '../components'
@@ -51,6 +51,7 @@ export function RunDashboard() {
   const createEncounter = useCreateEncounter(runIdNum)
   const updateEncounter = useUpdateEncounter(runIdNum)
   const updateRun = useUpdateRun(runIdNum)
+  const { data: namingCategories } = useNamingCategories()
   const [selectedEncounter, setSelectedEncounter] =
     useState<EncounterDetail | null>(null)
   const [showEndRun, setShowEndRun] = useState(false)
@@ -197,6 +198,37 @@ export function RunDashboard() {
         <RuleBadges rules={run.rules} />
       </div>
 
+      {/* Naming Scheme */}
+      {namingCategories && namingCategories.length > 0 && (
+        <div className="mb-6">
+          <h2 className="text-sm font-medium text-gray-500 dark:text-gray-400 mb-2">
+            Naming Scheme
+          </h2>
+          {isActive ? (
+            <select
+              value={run.namingScheme ?? ''}
+              onChange={(e) =>
+                updateRun.mutate({ namingScheme: e.target.value || null })
+              }
+              className="text-sm border border-gray-300 dark:border-gray-600 rounded-lg px-3 py-1.5 bg-white dark:bg-gray-800 text-gray-900 dark:text-gray-100"
+            >
+              <option value="">None</option>
+              {namingCategories.map((cat) => (
+                <option key={cat} value={cat}>
+                  {cat.charAt(0).toUpperCase() + cat.slice(1)}
+                </option>
+              ))}
+            </select>
+          ) : (
+            <span className="text-sm text-gray-900 dark:text-gray-100">
+              {run.namingScheme
+                ? run.namingScheme.charAt(0).toUpperCase() + run.namingScheme.slice(1)
+                : 'None'}
+            </span>
+          )}
+        </div>
+      )}
+
       {/* Active Team */}
       <div className="mb-6">
         <div className="flex items-center justify-between mb-3">