feat(AiProviders): refactor layout for upstream API key display

src/pages/AiProvidersAmpcodeEditPage.tsx

@@ -254,17 +254,8 @@ export function AiProvidersAmpcodeEditPage() {
           disabled={loading || saving || disableControls}
           hint={t('ai_providers.ampcode_upstream_api_key_hint')}
         />
-        <div
-          style={{
-            display: 'flex',
-            gap: 8,
-            alignItems: 'center',
-            marginTop: -8,
-            marginBottom: 12,
-            flexWrap: 'wrap',
-          }}
-        >
-          <div className="hint" style={{ margin: 0 }}>
+        <div className={layoutStyles.upstreamApiKeyRow}>
+          <div className={layoutStyles.upstreamApiKeyHint}>
             {t('ai_providers.ampcode_upstream_api_key_current', {
               key: config?.ampcode?.upstreamApiKey
                 ? maskApiKey(config.ampcode.upstreamApiKey)

src/pages/AiProvidersEditLayout.module.scss

@@ -3,3 +3,17 @@
   max-width: 960px;
   margin: 0 auto;
 }
+
+.upstreamApiKeyRow {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  flex-wrap: wrap;
+  margin-bottom: 16px;
+}
+
+.upstreamApiKeyHint {
+  margin: 0;
+  color: var(--text-secondary);
+  font-size: 13px;
+}