feat(branding): rebrand user-facing GPUStack to MesaStack

Applied via scripts/rebrand across UI labels, page title, and all
locale strings (en/zh/ja/ru/tr). Functional references untouched:
npm package, URLs, paths, JS identifiers, GPUSTACK_ constants, and the
X-GPUStack-Model header. The backend-contract startsWith string in
llmodels/hooks keeps "GPUStack server" to stay matchable. Logo images
intentionally left unchanged for now.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/locales/en-US/resources.ts

@@ -52,7 +52,7 @@ export default {
   'resources.worker.container.supported': 'Do not support macOS or Windows.',
   'resources.worker.current.version': 'Current version is {version}.',
   'resources.worker.driver.install':
-    'Install <a href="https://docs.gpustack.ai/latest/installation/installation-requirements/" target="_blank">required drivers and libraries</a> prior to GPUStack installation.',
+    'Install <a href="https://docs.gpustack.ai/latest/installation/installation-requirements/" target="_blank">required drivers and libraries</a> prior to MesaStack installation.',
   'resources.worker.select.command':
     'Select a label to generate the command and copy it using the copy button.',
   'resources.worker.script.install': 'Script Installation',
@@ -89,7 +89,7 @@ export default {
     'Paste the <span class="bold-text">Token</span>.',
   'resources.register.worker.step7':
     'Click <span class="bold-text">Restart</span> to apply the settings.',
-  'resources.register.install.title': 'Install GPUStack on {os}',
+  'resources.register.install.title': 'Install MesaStack on {os}',
   'resources.register.download':
     'Download and install the <a href={url} target="_blank">installer</a>. Only supported: {versions}.',
   'resource.register.maos.support': 'Apple Silicon (M series), macOS 14+',
@@ -111,7 +111,7 @@ export default {
     'No available clusters. Please create a cluster before adding a node.',
   'resources.metrics.details': 'Monitoring',
   'resoureces.worker.upgrade.tips':
-    'Please upgrade to match the GPUStack Server version.',
+    'Please upgrade to match the MesaStack Server version.',
   'resources.worker.version': 'Worker Version: {version}',
   'resources.server.version': 'Server Version: {version}',
   'resources.worker.currentVersion': 'Current Version: {version}',