server settings keyed (352 -> 267)

ServerSettings reaches zero: OCR, STT, TTS, SMTP, maintenance and the AI harnesses.

Two more hand-rolled plurals became real plural entries -- maintenance said
"commit" with a ternary on length === 1, and both read correctly at 0, 1 and 2 in
both locales now. The three Cancel buttons in AIHarnessesSection take ui.button.cancel
rather than adding a fourth app-level copy of the word, which is what phase 1 put it
there for.

Scanner: a single token carrying digits and punctuation is a name, not a sentence --
the OCR placeholder is the example model file Qwen2.5-VL-7B-Instruct-q4_k_m.gguf.
Prose has spaces, and requiring whitespace to be absent is what keeps this from
eating real one-word labels. Verified the delta is exactly that one string.

Note for the owner: another session has src/servers/api/sub-agents/router.ts in
flight with three type errors. Untouched by me and excluded from my gate; the full
tree will not typecheck clean until they land it.

src/apps/officer-web/Screens/Dashboard/Settings/ServerSettings/STTSection.tsx

@@ -6,12 +6,14 @@ import { Button } from '@/components/ui/button';
 import { Input } from '@/components/ui/input';
 import { Label } from '@/components/ui/label';
 import { useClient } from 'hooks/useClient';
+import { useTranslation } from '@/lib/i18n';
 
 type SttConfig = {
   url: string;
 };
 
 export const STTSection = () => {
+  const { t } = useTranslation();
   const client = useClient();
   const queryClient = useQueryClient();
 
@@ -36,9 +38,9 @@ export const STTSection = () => {
     try {
       await client.put('/server-settings/stt', { url });
       queryClient.invalidateQueries({ queryKey: ['STT_CONFIG'] });
-      toast.success('STT settings saved');
+      toast.success(t('settings.server.stt.saved'));
     } catch {
-      toast.error('Failed to save STT settings');
+      toast.error(t('settings.server.stt.saveFailed'));
     } finally {
       setIsSaving(false);
     }
@@ -52,7 +54,7 @@ export const STTSection = () => {
       if (res.error) {
         toast.error(res.error);
       } else {
-        toast.success('Whisper server is reachable');
+        toast.success(t('settings.server.stt.reachable'));
       }
     } catch (err: unknown) {
       const raw = (err as { message?: string })?.message;
@@ -68,12 +70,12 @@ export const STTSection = () => {
     }
   };
 
-  if (isLoading) return <p className="text-sm text-duck-dark/40">Loading...</p>;
+  if (isLoading) return <p className="text-sm text-duck-dark/40">{t('settings.server.loading')}</p>;
 
   return (
     <form onSubmit={handleSave} className="grid gap-4">
       <Label className="grid gap-2">
-        <span className="text-duck-dark/70 dark:text-foreground/70">Whisper Server URL</span>
+        <span className="text-duck-dark/70 dark:text-foreground/70">{t('settings.server.stt.serverUrl')}</span>
         <Input
           className="h-11 bg-background/60 border-duck-dark/20 text-duck-dark dark:text-foreground placeholder:text-duck-dark/40"
           placeholder="http://localhost:64201"