fix: resolve admin panel API path issues and ActionMenu overflow

- Fix duplicate /api/v1 paths in admin API calls
- Fix ActionMenu dropdown being clipped by using React Portal
- Fix TeamCategoriesPage API endpoints

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

frontend/src/pages/account/TeamCategoriesPage.tsx

@@ -23,7 +23,7 @@ export function TeamCategoriesPage() {
   const fetchData = useCallback(async () => {
     setLoading(true)
     try {
-      const res = await api.get('/api/v1/categories')
+      const res = await api.get('/categories')
       setCategories(res.data)
     } catch {
       toast.error('Failed to load categories')
@@ -39,7 +39,7 @@ export function TeamCategoriesPage() {
 
   const handleCreate = async () => {
     try {
-      await api.post('/api/v1/categories', form)
+      await api.post('/categories', form)
       toast.success('Category created')
       setCreateOpen(false)
       setForm({ name: '', slug: '', description: '' })
@@ -52,7 +52,7 @@ export function TeamCategoriesPage() {
   const handleUpdate = async () => {
     if (!editCategory) return
     try {
-      await api.put(`/api/v1/categories/${editCategory.id}`, form)
+      await api.put(`/categories/${editCategory.id}`, form)
       toast.success('Category updated')
       setEditCategory(null)
       setForm({ name: '', slug: '', description: '' })
@@ -64,7 +64,7 @@ export function TeamCategoriesPage() {
 
   const handleDelete = async (id: string) => {
     try {
-      await api.delete(`/api/v1/categories/${id}`)
+      await api.delete(`/categories/${id}`)
       toast.success('Category deleted')
       fetchData()
     } catch {