first implementation - image/drawing integration

backend/src/main/java/com/aiteacher/book/BookController.java

@@ -1,5 +1,7 @@
 package com.aiteacher.book;
 
+import com.aiteacher.document.FigureEntity;
+import com.aiteacher.document.FigureRepository;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.*;
@@ -15,9 +17,11 @@ import java.util.UUID;
 public class BookController {
 
     private final BookService bookService;
+    private final FigureRepository figureRepository;
 
-    public BookController(BookService bookService) {
+    public BookController(BookService bookService, FigureRepository figureRepository) {
         this.bookService = bookService;
+        this.figureRepository = figureRepository;
     }
 
     @PostMapping(consumes = "multipart/form-data")
@@ -46,6 +50,36 @@ public class BookController {
         return ResponseEntity.noContent().build();
     }
 
+    @PostMapping("/{id}/reembed")
+    public ResponseEntity<Map<String, Object>> reembed(@PathVariable UUID id) {
+        Book book = bookService.reembed(id);
+        return ResponseEntity.accepted().body(Map.of(
+            "bookId", book.getId(),
+            "status", BookStatus.PROCESSING.name()
+        ));
+    }
+
+    @GetMapping("/{id}/figures")
+    public ResponseEntity<List<FigureResponse>> figures(@PathVariable UUID id) {
+        bookService.getById(id); // 404 if not found
+        List<FigureResponse> responses = figureRepository.findAllByBookId(id)
+            .stream()
+            .map(f -> toFigureResponse(id, f))
+            .toList();
+        return ResponseEntity.ok(responses);
+    }
+
+    private FigureResponse toFigureResponse(UUID bookId, FigureEntity f) {
+        String filename = f.getImagePath().substring(f.getImagePath().lastIndexOf('/') + 1);
+        String imageUrl = "/api/v1/figures/" + bookId + "/" + filename;
+        return new FigureResponse(
+            f.getId(), f.getLabel(), f.getCaption(),
+            f.getFigureType().name(), f.getPage(), imageUrl,
+            f.getSectionId(),
+            null // section title not eagerly loaded here
+        );
+    }
+
     private Map<String, Object> toSummaryResponse(Book book) {
         return Map.of(
             "id", book.getId(),