fix: replace deprecated vim.loop with vim.uv

Problem: vim.loop is deprecated since Neovim 0.10 in favour of vim.uv.
Five call sites across scraper.lua, setup.lua, utils.lua, and health.lua
still referenced the old alias.

Solution: replace every vim.loop reference with vim.uv directly.

lua/cp/health.lua

@@ -13,7 +13,7 @@ local function check()
     vim.health.error('cp.nvim requires Neovim 0.10.0+')
   end
 
-  local uname = vim.loop.os_uname()
+  local uname = vim.uv.os_uname()
   if uname.sysname == 'Windows_NT' then
     vim.health.error('Windows is not supported')
   end