fix: sort export translations by key name (Sentry TOLGEE-BACKEND-3ED)

The StructureModelBuilder requires translations sorted alphabetically
by key name path, but the database collation may return them in a
different order. Sort in GenericStructuredFileExporter.prepare() to
ensure correct ordering regardless of database collation.

Likely triggered by the branching feature (#3246, merged Feb 6) which
added a LEFT JOIN on Branch to the export query. The additional join
changed the query execution plan, surfacing a collation mismatch
between PostgreSQL's locale-aware sorting and Java's byte-by-byte
string comparison for keys with punctuation (e.g. "profile.my-goals"
vs "profile.my-goals.plan_other").

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: bdshadow

backend/data/src/main/kotlin/io/tolgee/formats/genericStructuredFile/out/GenericStructuredFileExporter.kt

@@ -39,7 +39,7 @@ class GenericStructuredFileExporter(
   }
 
   private fun prepare() {
-    translations.forEach { translation ->
+    translations.sortedBy { it.key.name }.forEach { translation ->
       addTranslationToBuilder(translation)
     }
   }

backend/data/src/test/kotlin/io/tolgee/unit/formats/json/out/JsonFileExporterTest.kt

@@ -306,6 +306,32 @@ class JsonFileExporterTest {
     files["cs-rCZ/hello.json"].assert.isNotNull()
   }
 
+  @Test
+  fun `does not throw when translations are unsorted and key is prefix of another`() {
+    // Regression test: when database collation returns keys in non-alphabetical order,
+    // the exporter should sort them before building the nested structure.
+    // Keys like "profile.my-goals" and "profile.my-goals.plan_other" must be sorted
+    // so the parent path is processed before the child path.
+    val unsortedKeys = listOf("profile.my-goals.plan_other", "profile.my-goals")
+    val data = generateTranslationsForUnsortedKeys(unsortedKeys)
+    val exported = getExporter(data).produceFiles()
+    val json = exported.getFileTextContent("en.json")
+    assertThatJson(json) {
+      node("profile.my-goals").isEqualTo("text")
+      node("profile.my-goals\\.plan_other").isEqualTo("text")
+    }
+  }
+
+  private fun generateTranslationsForUnsortedKeys(keys: List<String>): List<ExportTranslationView> {
+    // Deliberately does NOT sort, to simulate wrong ordering from the database
+    return keys.map { keyName ->
+      val key = ExportKeyView(1, keyName, namespace = null)
+      val trans = ExportTranslationView(1, "text", TranslationState.TRANSLATED, key, "en")
+      key.translations["en"] = trans
+      trans
+    }
+  }
+
   private fun Map<String, InputStream>.getFileTextContent(fileName: String): String {
     return this[fileName]!!.bufferedReader().readText()
   }