stable POC version 1 - chat and topics

backend/src/main/java/com/aiteacher/topic/TopicController.java

@@ -10,23 +10,23 @@ import java.util.NoSuchElementException;
 @RequestMapping("/api/v1/topics")
 public class TopicController {
 
-    private final TopicConfigLoader topicConfigLoader;
+    private final TopicRepository topicRepository;
     private final TopicSummaryService topicSummaryService;
 
-    public TopicController(TopicConfigLoader topicConfigLoader,
+    public TopicController(TopicRepository topicRepository,
                            TopicSummaryService topicSummaryService) {
-        this.topicConfigLoader = topicConfigLoader;
+        this.topicRepository = topicRepository;
         this.topicSummaryService = topicSummaryService;
     }
 
     @GetMapping
     public ResponseEntity<List<Topic>> list() {
-        return ResponseEntity.ok(topicConfigLoader.getAll());
+        return ResponseEntity.ok(topicRepository.findAll());
     }
 
     @PostMapping("/{id}/summary")
     public ResponseEntity<TopicSummaryResponse> generateSummary(@PathVariable String id) {
-        Topic topic = topicConfigLoader.findById(id)
+        Topic topic = topicRepository.findById(id)
             .orElseThrow(() -> new NoSuchElementException("Topic not found."));
 
         TopicSummaryResponse response = topicSummaryService.generateSummary(topic);