feat: unify scoring and chat evidence pages

backend/wisegrade/api.py

@@ -11,8 +11,9 @@ from . import services
 from .config import get_settings
 from .db import get_db
 from .exports import batch_projects, export_excel, export_project_pdf, project_result
+from .knowledge_pages import page_image_path, page_links
 from .models import (AuditLog, Course, CourseVersion, CriterionScore, ExportTask,
-                     IndexTask, KnowledgeChunk, KnowledgeDocument, Project, RubricVersion, ScoringBatch,
+                     IndexTask, KnowledgeChunk, KnowledgeDocument, KnowledgePage, Project, RubricVersion, ScoringBatch,
                      Student, SubmissionFile, TeacherRevision)
 from .materialized import sync_course_entities, sync_rubric_entities
 from .rules import RubricData
@@ -330,13 +331,22 @@ def knowledge(course_version_id: int, project_id: int | None = None, db: Session
 @router.get("/knowledge/documents/{document_id}/pages/{page}")
 def knowledge_page(document_id: int, page: int, db: Session = Depends(get_db)):
     doc = found(db, KnowledgeDocument, document_id)
-    chunks = db.scalars(select(KnowledgeChunk).where(KnowledgeChunk.document_id == document_id,
-        KnowledgeChunk.page == page).order_by(KnowledgeChunk.id)).all()
-    if not chunks:
+    record = db.get(KnowledgePage, (document_id, page))
+    if not record:
         raise HTTPException(404, "资料页面不存在")
     return {"document_id": doc.id, "title": doc.title, "course_version_id": doc.course_version_id,
-            "project_id": doc.project_id, "page": page, "text": "\n".join(chunk.text for chunk in chunks),
-            "image_url": f"/api/assets/{doc.submission_file_id}/{page}" if doc.submission_file_id else None}
+            "project_id": doc.project_id, "page": page,
+            "text": record.text,
+            "image_url": page_links(db, document_id, page)["image_url"]}
+
+
+@router.get("/knowledge/documents/{document_id}/pages/{page}/image")
+def knowledge_page_image(document_id: int, page: int, db: Session = Depends(get_db)):
+    doc = found(db, KnowledgeDocument, document_id)
+    path = page_image_path(db, doc, page)
+    if not path:
+        raise HTTPException(404, "页面图像不存在")
+    return FileResponse(path, media_type="image/png")
 
 
 @router.post("/knowledge/ingest-course/{course_version_id}")