fix: improve import, evidence indexing and material-scoped grading

Preserve document revisions and evidence, harden indexing and export behavior, add explicit material selection and direct-folder import, validate model JSON schemas with safe error messages, and retain student selection while loading scoring data.

backend/wisegrade/storage.py

@@ -46,9 +46,9 @@ def parse_student_folder(name: str):
 
 def extract_identity(text: str):
     patterns = {
-        "student_no": r"学号\s*[:：]?\s*(\d{5,20})",
-        "name": r"姓名\s*[:：]?\s*([^\s:：]{2,10})",
-        "topic": r"(?:课题名称|项目名称|题目)\s*[:：]?\s*([^\n\r]{3,100})",
+        "student_no": r"学\s*号\s*[:：]?\s*(\d{5,20})",
+        "name": r"姓\s*名\s*[:：]?\s*([^\s:：]{2,10})",
+        "topic": r"(?:课\s*题\s*名\s*称|项\s*目\s*名\s*称|题\s*目)\s*[:：]?\s*([^\n\r]{3,100})",
     }
     return {key: (match.group(1).strip() if (match := re.search(pattern, text)) else "") for key, pattern in patterns.items()}
 
@@ -103,14 +103,20 @@ def scan(relative: str, *, root: Path | None = None):
     base = (root or get_settings().inbox_path).resolve()
     path = secure_path(relative, root=base)
     if not path.is_dir():
-        raise ValueError("请选择学生总目录")
+        raise ValueError("请选择学生总目录或资料目录")
     projects = []
-    for folder in sorted(path.iterdir()):
-        if not folder.is_dir() or folder.is_symlink():
-            continue
+    def has_materials(folder):
+        return any(item.is_file() and not item.is_symlink() and item.suffix.lower() in SUPPORTED
+                   for item in folder.iterdir())
+
+    folders = ([path] if has_materials(path) else []) + [
+        item for item in sorted(path.iterdir())
+        if item.is_dir() and not item.is_symlink() and has_materials(item)]
+    for folder in folders:
         info = parse_student_folder(folder.name)
         files = []
         extracted = {}
+        identity_values = {}
         warnings = []
         for candidate in sorted(folder.iterdir()):
             if not candidate.is_file() or candidate.is_symlink():
@@ -123,8 +129,8 @@ def scan(relative: str, *, root: Path | None = None):
                 category, status = classify(candidate, text)
                 identity = extract_identity(text)
                 for key, value in identity.items():
-                    if value and key not in extracted:
-                        extracted[key] = value
+                    if value:
+                        identity_values.setdefault(key, set()).add(value)
             except ValueError as exc:
                 category, status, error = "unknown", "unparseable", str(exc)
             stat = candidate.stat()
@@ -137,9 +143,16 @@ def scan(relative: str, *, root: Path | None = None):
             if len(matches) > 1:
                 for file in matches:
                     file["status"] = "duplicate"
+        for key, values in identity_values.items():
+            if len(values) > 1:
+                warnings.append(f"不同材料封面的{key}不一致，请核对后填写")
+            else:
+                extracted[key] = next(iter(values))
         for key, value in extracted.items():
             if info.get(key) and value != info[key]:
                 warnings.append(f"封面{key}“{value}”与目录名“{info[key]}”不一致")
+            elif not info.get(key):
+                info[key] = value
         if warnings:
             info["status"] = "needs_confirmation"
         info.update({"relative_dir": folder.relative_to(base).as_posix(), "files": files,