refactor: Remove dead code and stale references (#2154)

* refactor: Remove redundant loadTokenFromConfig wrappers in hetzner, daytona, digitalocean

The previous PR (#2151) introduced shared loadApiToken() in shared/ui.ts and
updated hetzner/daytona to delegate to it via thin wrapper functions. This
commit removes the now-unnecessary wrapper functions entirely, inlining the
loadApiToken() calls directly at the callsite.

Also removes the 16-line duplicate loadTokenFromConfig() implementation in
digitalocean.ts (which replicates the same api_key/token field reading and
regex validation logic as loadApiToken) and replaces it with a direct call to
loadApiToken("digitalocean").

-- qa/code-quality

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* bump version to 0.12.12 (main already has 0.12.11)

---------

Co-authored-by: spawn-qa-bot <qa@openrouter.ai>
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-authored-by: L <6723574+louisgv@users.noreply.github.com>

packages/cli/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@openrouter/spawn",
-  "version": "0.12.11",
+  "version": "0.12.12",
   "type": "module",
   "bin": {
     "spawn": "cli.js"