Move inlay_hints opt to top level of lspconfig

Nested under `diagnostics` it was silently ignored; LazyVim reads
`inlay_hints` from the top of the nvim-lspconfig opts table.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: tarebyte

dot_config/nvim/lua/plugins/lsp.lua

@@ -31,6 +31,7 @@ return {
   {
     "neovim/nvim-lspconfig",
     opts = {
+      inlay_hints = { enabled = false },
       diagnostics = {
         signs = {
           text = {
@@ -40,9 +41,6 @@ return {
             [vim.diagnostic.severity.HINT] = "▎",
           },
         },
-        inlay_hints = {
-          enabled = false,
-        },
         virtual_text = false,
         float = {
           border = "rounded",