Add admin panel with CRUD endpoints and management UI

Add admin API endpoints for games, routes, pokemon, and route encounters
with full CRUD operations including bulk import. Build admin frontend
with game/route/pokemon management pages, navigation, and data tables.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/src/components/admin/FormModal.tsx

@@ -0,0 +1,49 @@
+import { type FormEvent, type ReactNode } from 'react'
+
+interface FormModalProps {
+  title: string
+  onClose: () => void
+  onSubmit: (e: FormEvent) => void
+  children: ReactNode
+  submitLabel?: string
+  isSubmitting?: boolean
+}
+
+export function FormModal({
+  title,
+  onClose,
+  onSubmit,
+  children,
+  submitLabel = 'Save',
+  isSubmitting,
+}: FormModalProps) {
+  return (
+    <div className="fixed inset-0 z-50 flex items-center justify-center">
+      <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-lg 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">{title}</h2>
+        </div>
+        <form onSubmit={onSubmit}>
+          <div className="px-6 py-4 space-y-4">{children}</div>
+          <div className="px-6 py-4 border-t border-gray-200 dark:border-gray-700 flex justify-end gap-3">
+            <button
+              type="button"
+              onClick={onClose}
+              className="px-4 py-2 text-sm font-medium rounded-md border border-gray-300 dark:border-gray-600 hover:bg-gray-50 dark:hover:bg-gray-700"
+            >
+              Cancel
+            </button>
+            <button
+              type="submit"
+              disabled={isSubmitting}
+              className="px-4 py-2 text-sm font-medium rounded-md bg-blue-600 text-white hover:bg-blue-700 disabled:opacity-50"
+            >
+              {isSubmitting ? 'Saving...' : submitLabel}
+            </button>
+          </div>
+        </form>
+      </div>
+    </div>
+  )
+}