fix(model): drop unused User#karma field and update test cases

api/src/test/kotlin/dev/msfjarvis/claw/api/ApiTest.kt

@@ -40,7 +40,7 @@ class ApiTest {
 
   @Test
   fun `post details with comments`() = runBlocking {
-    val postDetails = api.getPostDetails("d9ucpe")
+    val postDetails = api.getPostDetails("tdfoqh")
     assertEquals(7, postDetails.comments.size)
   }
 

api/src/test/kotlin/dev/msfjarvis/claw/api/FakeApi.kt

@@ -12,7 +12,7 @@ class FakeApi(private val delegate: BehaviorDelegate<LobstersApi>) : LobstersApi
   private val json = Json { ignoreUnknownKeys = true }
   private val hottest: List<LobstersPost> = json.decodeFromString(getJson("hottest.json"))
   private val postDetails: LobstersPostDetails =
-    json.decodeFromString(getJson("post_details_d9ucpe.json"))
+    json.decodeFromString(getJson("post_details_tdfoqh.json"))
   private val user: User = json.decodeFromString(getJson("msfjarvis.json"))
 
   override suspend fun getHottestPosts(page: Int): List<LobstersPost> {