Return uppercase country name list for country search API

docs/API_REFERENCE.txt

@@ -157,7 +157,8 @@ AUTH + SYSTEM APIS
 
   - Searches countries from local country_reference table.
   - Case-insensitive match on country name, official name, ISO alpha-2, and ISO alpha-3.
-  - Example: q=IND returns matches like India and related country names.
+  - Returns JSON array of uppercase country names only.
+  - Example: q=IND can return ["INDIA", "INDONESIA", ...].
 
   Request body:
 

src/main/kotlin/com/android/trisolarisserver/controller/system/CountrySearch.kt

@@ -7,6 +7,7 @@ import org.springframework.web.bind.annotation.GetMapping
 import org.springframework.web.bind.annotation.RequestParam
 import org.springframework.web.bind.annotation.RestController
 import org.springframework.web.server.ResponseStatusException
+import java.util.Locale
 
 @RestController
 class CountrySearch(
@@ -16,7 +17,7 @@ class CountrySearch(
     fun searchCountries(
         @RequestParam("q") q: String,
         @RequestParam("limit", required = false, defaultValue = "20") limit: Int
-    ): List<CountrySearchResponse> {
+    ): List<String> {
         val query = q.trim()
         if (query.length < 3) {
             throw ResponseStatusException(HttpStatus.BAD_REQUEST, "q must be at least 3 characters")
@@ -24,20 +25,6 @@ class CountrySearch(
         val boundedLimit = limit.coerceIn(1, 100)
         return countryReferenceRepo
             .searchCountries(query, PageRequest.of(0, boundedLimit))
-            .map {
-                CountrySearchResponse(
-                    name = it.name,
-                    officialName = it.officialName,
-                    isoAlpha2 = it.isoAlpha2,
-                    isoAlpha3 = it.isoAlpha3
-                )
-            }
+            .map { it.name.uppercase(Locale.ROOT) }
     }
 }
-
-data class CountrySearchResponse(
-    val name: String,
-    val officialName: String?,
-    val isoAlpha2: String?,
-    val isoAlpha3: String?
-)

src/main/kotlin/com/android/trisolarisserver/repo/property/CountryReferenceRepo.kt

@@ -9,10 +9,7 @@ import org.springframework.data.repository.query.Param
 interface CountryReferenceRepo : JpaRepository<CountryReference, Long> {
     @Query(
         """
-        select c.name as name,
-               c.officialName as officialName,
-               c.isoAlpha2 as isoAlpha2,
-               c.isoAlpha3 as isoAlpha3
+        select c.name as name
         from CountryReference c
         where trim(c.name) <> ''
           and (
@@ -35,12 +32,9 @@ interface CountryReferenceRepo : JpaRepository<CountryReference, Long> {
     fun searchCountries(
         @Param("query") query: String,
         pageable: Pageable
-    ): List<CountrySearchRow>
+    ): List<CountryNameRow>
 }
 
-interface CountrySearchRow {
+interface CountryNameRow {
     val name: String
-    val officialName: String?
-    val isoAlpha2: String?
-    val isoAlpha3: String?
 }