fix(#240): remove readyCount from weekly stats DTO and SQL query

The Lesefertig pulse was removed from the UI; drop the backend support
for it too — removes the subquery from findWeeklyStats(), the projection
getter, the DTO field, and updates all affected tests.

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

backend/src/test/java/org/raddatz/familienarchiv/controller/TranscriptionQueueControllerTest.java

@@ -44,7 +44,7 @@ class TranscriptionQueueControllerTest {
             3, 1, 0
     );
 
-    private static final TranscriptionWeeklyStatsDTO STATS = new TranscriptionWeeklyStatsDTO(2L, 5L, 1L);
+    private static final TranscriptionWeeklyStatsDTO STATS = new TranscriptionWeeklyStatsDTO(2L, 5L);
 
     // ─── segmentation-queue ───────────────────────────────────────────────────
 
@@ -145,7 +145,6 @@ class TranscriptionQueueControllerTest {
         mockMvc.perform(get("/api/transcription/weekly-stats"))
                 .andExpect(status().isOk())
                 .andExpect(jsonPath("$.segmentationCount").value(2))
-                .andExpect(jsonPath("$.transcriptionCount").value(5))
-                .andExpect(jsonPath("$.readyCount").value(1));
+                .andExpect(jsonPath("$.transcriptionCount").value(5));
     }
 }

backend/src/test/java/org/raddatz/familienarchiv/repository/DocumentRepositoryTest.java

@@ -343,7 +343,6 @@ class DocumentRepositoryTest {
 
         assertThat(stats.getSegmentationCount()).isEqualTo(0L);
         assertThat(stats.getTranscriptionCount()).isEqualTo(0L);
-        assertThat(stats.getReadyCount()).isEqualTo(0L);
     }
 
     // ─── seeding helpers ─────────────────────────────────────────────────────

backend/src/test/java/org/raddatz/familienarchiv/service/TranscriptionQueueServiceTest.java

@@ -88,26 +88,24 @@ class TranscriptionQueueServiceTest {
 
     @Test
     void getWeeklyStats_mapsProjectionToDTO() {
-        TranscriptionWeeklyStatsProjection proj = mockStatsProjection(3L, 7L, 2L);
+        TranscriptionWeeklyStatsProjection proj = mockStatsProjection(3L, 7L);
         when(documentRepository.findWeeklyStats()).thenReturn(proj);
 
         TranscriptionWeeklyStatsDTO result = service.getWeeklyStats();
 
         assertThat(result.segmentationCount()).isEqualTo(3L);
         assertThat(result.transcriptionCount()).isEqualTo(7L);
-        assertThat(result.readyCount()).isEqualTo(2L);
     }
 
     @Test
     void getWeeklyStats_returnsZeros_whenAllCountsAreZero() {
-        TranscriptionWeeklyStatsProjection proj = mockStatsProjection(0L, 0L, 0L);
+        TranscriptionWeeklyStatsProjection proj = mockStatsProjection(0L, 0L);
         when(documentRepository.findWeeklyStats()).thenReturn(proj);
 
         TranscriptionWeeklyStatsDTO result = service.getWeeklyStats();
 
         assertThat(result.segmentationCount()).isEqualTo(0L);
         assertThat(result.transcriptionCount()).isEqualTo(0L);
-        assertThat(result.readyCount()).isEqualTo(0L);
     }
 
     // ─── helpers ─────────────────────────────────────────────────────────────
@@ -126,11 +124,10 @@ class TranscriptionQueueServiceTest {
     }
 
     private TranscriptionWeeklyStatsProjection mockStatsProjection(
-            long segmentationCount, long transcriptionCount, long readyCount) {
+            long segmentationCount, long transcriptionCount) {
         TranscriptionWeeklyStatsProjection proj = mock(TranscriptionWeeklyStatsProjection.class);
         when(proj.getSegmentationCount()).thenReturn(segmentationCount);
         when(proj.getTranscriptionCount()).thenReturn(transcriptionCount);
-        when(proj.getReadyCount()).thenReturn(readyCount);
         return proj;
     }
 }