feat(i18n): resolve Species/Breed display names via SpeciesTranslation/BreedTranslation

User found "Cat" showing English on a German-locale profile page. Root
cause: Species.name/Breed.name are the canonical English values; a
SpeciesTranslation/BreedTranslation table + seed data (Hund/Katze/Vogel
etc.) already existed in the schema, and PetForm's species/breed picker
already used it correctly via an explicit locale input param — but every
*display* surface (pet profile, PetCard, Sidebar/MobileNav, search,
explore, followers/following lists, mention @-search, health-card) just
read the raw untranslated name.

Adds `locale` to the tRPC context (createTRPCContext reads the
NEXT_LOCALE cookie the same way i18n/request.ts does), so read
procedures can resolve translations without every caller needing to
pass a locale param. New src/lib/localized-name.ts::pickLocalizedName()
does the lookup with a same-shape fallback to the raw name.

Updated: pets.ts (list/byId/getProfile/update), search.ts (pets/byOwner),
explore.ts (listPets), follows.ts (listFollowers/listFollowing).
health-card/[token]/page.tsx (public, unauthenticated, intentionally
all-German) resolves with a fixed "de" locale instead of ctx.locale,
consistent with its existing hardcoded WeightChart locale.

Verified the seed data is actually present in the production DB
(SpeciesTranslation has Dog→Hund, Cat→Katze, Bird→Vogel) — this fix is
immediately effective on deploy, not blocked on a missing seed run.

src/app/health-card/[token]/page.tsx

@@ -8,6 +8,7 @@ import { getAvatarUrl } from "@/lib/avatar-url";
 import { PrintButton } from "@/components/health/PrintButton";
 import { AutoPrint } from "@/components/health/AutoPrint";
 import { WeightChart } from "@/components/health/WeightChart";
+import { pickLocalizedName } from "@/lib/localized-name";
 
 interface PageProps {
   params: Promise<{ token: string }>;
@@ -41,8 +42,8 @@ export default async function HealthCardPage({ params, searchParams }: PageProps
     include: {
       pet: {
         include: {
-          species: true,
-          breed: true,
+          species: { include: { translations: { where: { locale: "de" } } } },
+          breed: { include: { translations: { where: { locale: "de" } } } },
           weightLogs: { orderBy: { date: "desc" }, take: 20 },
           vetVisits: { orderBy: { date: "desc" }, take: 10 },
           vaccines: { orderBy: { dateGiven: "desc" } },
@@ -81,6 +82,8 @@ export default async function HealthCardPage({ params, searchParams }: PageProps
 
   const { pet } = card;
   const avatarUrl = getAvatarUrl(pet.avatarKey);
+  const speciesName = pickLocalizedName(pet.species.name, pet.species.translations, "de");
+  const breedName = pet.breed ? pickLocalizedName(pet.breed.name, pet.breed.translations, "de") : null;
 
   return (
     <div className="min-h-screen bg-muted/30">
@@ -110,8 +113,8 @@ export default async function HealthCardPage({ params, searchParams }: PageProps
           <div>
             <h1 className="text-xl font-semibold">{pet.name}</h1>
             <div className="flex items-center gap-2 mt-1">
-              <Badge variant="secondary">{pet.species.name}</Badge>
-              {pet.breed && <Badge variant="outline">{pet.breed.name}</Badge>}
+              <Badge variant="secondary">{speciesName}</Badge>
+              {breedName && <Badge variant="outline">{breedName}</Badge>}
             </div>
           </div>
         </div>