feat(frontend): use offline global birth place hierarchy

frontend/src/app/page.tsx

@@ -903,6 +903,7 @@ function BirthLocationFields({ value, onChange }: { value: Profile; onChange: (p
       <legend>出生地点</legend>
       <BirthPlacePicker
         value={{
+          countryCode: value.countryCode,
           provinceCode: value.provinceCode,
           cityCode: value.cityCode,
           districtCode: value.districtCode,
@@ -913,13 +914,13 @@ function BirthLocationFields({ value, onChange }: { value: Profile; onChange: (p
         birthTime={value.reportedTime || value.time}
         onChange={(location) => onChange({
           ...value,
-          countryCode: "CN",
+          countryCode: location?.countryCode || "CN",
           provinceCode: location?.provinceCode || "",
           cityCode: location?.cityCode || "",
           districtCode: location?.districtCode || "",
           birthPlaceLabel: location?.label || "",
           birthPlaceType: location?.placeType || "",
-          birthPlaceProvider: location ? "china_locations" : "",
+          birthPlaceProvider: location?.provider || "",
           birthPlaceProviderId: location?.providerPlaceId || "",
           timezoneId: location?.timezoneId || "",
           timezoneSource: location ? "iana_historical" : "",