fix(install): simplify to the direct /releases/download/latest/ URL

Gitea serves the most recent release under the `latest` tag segment, so
`/releases/download/latest/nuwiki-ls-<target>.tar.gz` resolves directly
(HTTP 200) — no API lookup or JSON parsing needed. Drop the
latest_asset_url helpers added in the previous fix; the only real bug was
the URL shape (`/releases/latest/download/` is GitHub-only and 404s on
Gitea). Both install paths now just pick the target and build the URL.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

scripts/download_bin.vim

@@ -48,30 +48,6 @@ function! s:build_from_source() abort
   return executable(s:bin)
 endfunction
 
-" Gitea has no GitHub-style /releases/latest/download/<asset> shortcut, so
-" resolve the asset's real download URL (browser_download_url) via the API.
-function! s:latest_asset_url(asset) abort
-  let l:api = 'https://code.gfran.co/api/v1/repos/gffranco/nuwiki/releases/latest'
-  let l:body = system('curl -fsSL ' . shellescape(l:api))
-  if v:shell_error != 0
-    return ''
-  endif
-  try
-    let l:release = json_decode(l:body)
-  catch
-    return ''
-  endtry
-  if type(l:release) != type({}) || !has_key(l:release, 'assets')
-    return ''
-  endif
-  for l:item in l:release.assets
-    if get(l:item, 'name', '') ==# a:asset
-      return get(l:item, 'browser_download_url', '')
-    endif
-  endfor
-  return ''
-endfunction
-
 function! s:download_release() abort
   let l:target = s:target()
   if empty(l:target)
@@ -80,10 +56,11 @@ function! s:download_release() abort
   if !executable('curl') || !executable('tar')
     return 0
   endif
-  let l:url = s:latest_asset_url('nuwiki-ls-' . l:target . '.tar.gz')
-  if empty(l:url)
-    return 0
-  endif
+  " Gitea serves the most recent release under the `latest` tag segment
+  " (/releases/download/latest/<asset>). NOT GitHub's
+  " /releases/latest/download/<asset> shape, which Gitea 404s.
+  let l:url = 'https://code.gfran.co/gffranco/nuwiki/releases/download/latest/nuwiki-ls-'
+        \ . l:target . '.tar.gz'
   let l:archive = tempname() . '.tar.gz'
   call system('curl -fsSL -o ' . shellescape(l:archive) . ' ' . shellescape(l:url))
   if v:shell_error != 0