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/lib/localized-name.ts

@@ -0,0 +1,20 @@
+import "server-only";
+
+interface NameTranslation {
+  locale: string;
+  name: string;
+}
+
+/**
+ * Resolves a translated display name from a SpeciesTranslation/BreedTranslation
+ * row set, falling back to the canonical (English) `name` field when no
+ * translation matches the requested locale (e.g. locale is "en", or the
+ * translation just hasn't been seeded for that locale).
+ */
+export function pickLocalizedName(
+  name: string,
+  translations: NameTranslation[] | null | undefined,
+  locale: string
+): string {
+  return translations?.find((t) => t.locale === locale)?.name ?? name;
+}