personality: bool API, i18n across the app

- Collapse intent tri-state (respond/rewrite/compose) to `personality: bool` on /generate, /speak, and voicebox.speak. Drop respond entirely; keep compose as a standalone button via /profiles/{id}/compose. Remove /rewrite, /respond, and /speak profile endpoints.
- FloatingGenerateBox: Wand2 persona toggle + Dices compose button appear when the selected profile has a personality. ProfileCard badges Wand2 alongside the effects Sparkles.
- MCP bindings: default_intent column → default_personality: bool. Migration drops the legacy column.
- i18n: en / ja / zh-CN / zh-TW translation files filled out and wired through the capture, server, and profile UI.

```ts
voicebox.speak({
  text: "Deploy complete.",
  profile: "Morgan",
  personality: true, // rewrite through the profile's personality LLM
});
```

app/src/components/VoiceProfiles/ProfileCard.tsx

@@ -1,4 +1,4 @@
-import { Download, Edit, Sparkles, Trash2 } from 'lucide-react';
+import { Download, Edit, Sparkles, Trash2, Wand2 } from 'lucide-react';
 import { useState } from 'react';
 import { useTranslation } from 'react-i18next';
 import { Badge } from '@/components/ui/badge';
@@ -126,6 +126,9 @@ export function ProfileCard({ profile, disabled }: ProfileCardProps) {
             {profile.effects_chain && profile.effects_chain.length > 0 && (
               <Sparkles className="h-3.5 w-3.5 text-accent fill-accent" />
             )}
+            {profile.personality?.trim() && (
+              <Wand2 className="h-3.5 w-3.5 text-accent" />
+            )}
           </div>
           <div className="flex gap-0.5 justify-end items-end mt-auto">
             <CircleButton

app/src/components/VoiceProfiles/ProfileForm.tsx

@@ -1197,16 +1197,16 @@ export function ProfileForm() {
                     name="personality"
                     render={({ field }) => (
                       <FormItem>
-                        <FormLabel>Personality</FormLabel>
+                        <FormLabel>{t('profileForm.fields.personalityLabel')}</FormLabel>
                         <FormControl>
                           <Textarea
-                            placeholder="Optional. Who this voice is and how they talk. E.g. &quot;a grumpy pirate who only speaks in nautical metaphors&quot;. Used by Compose, Rewrite, and the Speak API."
+                            placeholder={t('profileForm.fields.personalityPlaceholder')}
                             className="min-h-[96px]"
                             {...field}
                           />
                         </FormControl>
                         <FormDescription>
-                          Leave blank to hide the Compose and Rewrite buttons on the generate page.
+                          {t('profileForm.fields.personalityHint')}
                         </FormDescription>
                         <FormMessage />
                       </FormItem>