nvim: replace pylsp with ty, drop black from LSP list

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

common/nvim/init.lua

@@ -84,7 +84,7 @@ require("nvim-treesitter").setup( {
     highlight = { enable = true },
 })
 
-vim.lsp.enable({ "lua_ls", "rust_analyzer", "julials", "pylsp", "black", "marksman", "ruff", "clangd" })
+vim.lsp.enable({ "lua_ls", "rust_analyzer", "julials", "ty", "marksman", "ruff", "clangd" })
 vim.lsp.config("rust_analyzer", {
     settings = {
         ["rust-analyzer"] = {