Add bulk import for evolutions, routes, and bosses

Add three new bulk import endpoints that accept the same JSON format as
their corresponding export endpoints, enabling round-trip compatibility:

- POST /evolutions/bulk-import (upsert by from/to pokemon pair)
- POST /games/{id}/routes/bulk-import (reuses seed loader for hierarchy)
- POST /games/{id}/bosses/bulk-import (reuses seed loader with team data)

Generalize BulkImportModal to support all entity types with configurable
title, example, and result labels. Wire up Bulk Import buttons on
AdminEvolutions, and AdminGameDetail routes/bosses tabs.

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

frontend/src/components/admin/BulkImportModal.tsx

@@ -2,16 +2,17 @@ import { type FormEvent, useState } from 'react'
 import type { BulkImportResult } from '../../types'
 
 interface BulkImportModalProps {
-  onSubmit: (items: Array<{ pokeapiId: number; nationalDex: number; name: string; types: string[]; spriteUrl?: string | null }>) => Promise<BulkImportResult>
+  title: string
+  example?: string
+  onSubmit: (items: unknown[]) => Promise<BulkImportResult>
   onClose: () => void
+  /** Label for the "created" count in the result summary */
+  createdLabel?: string
+  /** Label for the "updated" count in the result summary */
+  updatedLabel?: string
 }
 
-const EXAMPLE = `[
-  { "pokeapiId": 1, "nationalDex": 1, "name": "Bulbasaur", "types": ["Grass", "Poison"] },
-  { "pokeapiId": 4, "nationalDex": 4, "name": "Charmander", "types": ["Fire"] }
-]`
-
-export function BulkImportModal({ onSubmit, onClose }: BulkImportModalProps) {
+export function BulkImportModal({ title, example, onSubmit, onClose, createdLabel = 'Created', updatedLabel = 'Updated' }: BulkImportModalProps) {
   const [json, setJson] = useState('')
   const [error, setError] = useState<string | null>(null)
   const [result, setResult] = useState<BulkImportResult | null>(null)
@@ -27,13 +28,13 @@ export function BulkImportModal({ onSubmit, onClose }: BulkImportModalProps) {
       items = JSON.parse(json)
       if (!Array.isArray(items)) throw new Error('Must be an array')
     } catch {
-      setError('Invalid JSON. Must be an array of pokemon objects.')
+      setError('Invalid JSON. Must be an array of objects.')
       return
     }
 
     setIsSubmitting(true)
     try {
-      const res = await onSubmit(items as Array<{ pokeapiId: number; nationalDex: number; name: string; types: string[] }>)
+      const res = await onSubmit(items)
       setResult(res)
     } catch (err) {
       setError(err instanceof Error ? err.message : 'Import failed')
@@ -47,7 +48,7 @@ export function BulkImportModal({ onSubmit, onClose }: BulkImportModalProps) {
       <div className="fixed inset-0 bg-black/50" onClick={onClose} />
       <div className="relative bg-white dark:bg-gray-800 rounded-lg shadow-xl max-w-2xl w-full mx-4 max-h-[90vh] overflow-y-auto">
         <div className="px-6 py-4 border-b border-gray-200 dark:border-gray-700">
-          <h2 className="text-lg font-semibold">Bulk Import Pokemon</h2>
+          <h2 className="text-lg font-semibold">{title}</h2>
         </div>
         <form onSubmit={handleSubmit}>
           <div className="px-6 py-4 space-y-4">
@@ -59,7 +60,7 @@ export function BulkImportModal({ onSubmit, onClose }: BulkImportModalProps) {
                 rows={12}
                 value={json}
                 onChange={(e) => setJson(e.target.value)}
-                placeholder={EXAMPLE}
+                placeholder={example}
                 className="w-full px-3 py-2 border rounded-md font-mono text-sm dark:bg-gray-700 dark:border-gray-600"
               />
             </div>
@@ -72,7 +73,7 @@ export function BulkImportModal({ onSubmit, onClose }: BulkImportModalProps) {
 
             {result && (
               <div className="p-3 bg-green-50 dark:bg-green-900/30 text-green-700 dark:text-green-300 rounded-md text-sm">
-                <p>Created: {result.created}, Updated: {result.updated}</p>
+                <p>{createdLabel}: {result.created}, {updatedLabel}: {result.updated}</p>
                 {result.errors.length > 0 && (
                   <ul className="mt-2 list-disc list-inside text-red-600 dark:text-red-400">
                     {result.errors.map((err, i) => (