精简 Problem 模型：移除 rule_type / total_score / io_mode

系统只用 ACM 模式且题目固定标准 IO，这三列已无实际用途：
- rule_type / total_score：OI 专用，删除后 judge/dispatcher 的 OI 分支全部塌缩为 ACM
- io_mode：判题改为固定发送 Standard IO 常量；languages.py 的 seccomp_rule
  保留 dict 形态但改用字面量 key，不改判题机 wire 契约
- prompt 字段保留（预留给未来 AI 分析）

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

problem/migrations/0001_initial.py

@@ -1,7 +1,6 @@
 # Generated by Django 5.2.3 on 2025-06-14 08:51
 
 import django.db.models.deletion
-import problem.models
 import utils.models
 from django.conf import settings
 from django.db import migrations, models
@@ -47,7 +46,7 @@ class Migration(migrations.Migration):
                 ('last_update_time', models.DateTimeField(auto_now=True, null=True)),
                 ('time_limit', models.IntegerField()),
                 ('memory_limit', models.IntegerField()),
-                ('io_mode', models.JSONField(default=problem.models._default_io_mode)),
+                ('io_mode', models.JSONField(default=dict)),
                 ('spj', models.BooleanField(default=False)),
                 ('spj_language', models.TextField(null=True)),
                 ('spj_code', models.TextField(null=True)),

problem/migrations/0013_remove_problem_io_mode_remove_problem_rule_type_and_more.py

@@ -0,0 +1,25 @@
+# Generated by Django 6.0.4 on 2026-07-04 17:27
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('problem', '0012_problem_sql_display'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='problem',
+            name='io_mode',
+        ),
+        migrations.RemoveField(
+            model_name='problem',
+            name='rule_type',
+        ),
+        migrations.RemoveField(
+            model_name='problem',
+            name='total_score',
+        ),
+    ]

problem/models.py

@@ -13,24 +13,6 @@ class ProblemTag(models.Model):
         db_table = "problem_tag"
 
 
-class ProblemRuleType(models.TextChoices):
-    ACM = "ACM", "ACM"
-    OI = "OI", "OI"
-
-
-class ProblemIOMode(models.TextChoices):
-    STANDARD = "Standard IO", "Standard IO"
-    FILE = "File IO", "File IO"
-
-
-def _default_io_mode():
-    return {
-        "io_mode": ProblemIOMode.STANDARD,
-        "input": "input.txt",
-        "output": "output.txt",
-    }
-
-
 class Problem(models.Model):
     # display ID
     _id = models.TextField(db_index=True)
@@ -58,18 +40,14 @@ class Problem(models.Model):
     time_limit = models.IntegerField()
     # MB
     memory_limit = models.IntegerField()
-    # io mode
-    io_mode = models.JSONField(default=_default_io_mode)
-    rule_type = models.TextField(choices=ProblemRuleType.choices)
     visible = models.BooleanField(default=True, db_default=True)
     difficulty = models.TextField(choices=Difficulty.choices)
     tags = models.ManyToManyField(ProblemTag)
     source = models.TextField(null=True)
+    # 预留：题目考察知识点，供未来 AI 分析使用（当前未接线）
     prompt = models.TextField(null=True)
     # [{language: "python", code: "..."}]
     answers = models.JSONField(null=True)
-    # for OI mode
-    total_score = models.IntegerField(default=0, db_default=0)
     submission_number = models.BigIntegerField(default=0, db_default=0)
     accepted_number = models.BigIntegerField(default=0, db_default=0)
     # {JudgeStatus.ACCEPTED: 3, JudgeStatus.WRONG_ANSWER: 11}, the number means count

problem/serializers.py

@@ -1,5 +1,3 @@
-import re
-
 from django import forms
 
 from utils.api import UsernameSerializer, serializers
@@ -9,7 +7,7 @@ from utils.serializers import (
     LanguageNameMultiChoiceField,
 )
 
-from .models import Problem, ProblemIOMode, ProblemRuleType, ProblemTag
+from .models import Problem, ProblemTag
 from .utils import parse_problem_template
 
 
@@ -48,20 +46,6 @@ class SQLTestCasePreviewSerializer(serializers.Serializer):
     mode = serializers.ChoiceField(choices=["query", "modify"])
 
 
-class ProblemIOModeSerializer(serializers.Serializer):
-    io_mode = serializers.ChoiceField(choices=ProblemIOMode.choices)
-    input = serializers.CharField()
-    output = serializers.CharField()
-
-    def validate(self, attrs):
-        if attrs["input"] == attrs["output"]:
-            raise serializers.ValidationError("Invalid io mode")
-        for item in (attrs["input"], attrs["output"]):
-            if not re.match("^[a-zA-Z0-9.]+$", item):
-                raise serializers.ValidationError("Invalid io file name format")
-        return attrs
-
-
 class CreateOrEditProblemSerializer(serializers.Serializer):
     _id = serializers.CharField(max_length=32, allow_blank=True, allow_null=True)
     title = serializers.CharField(max_length=1024)
@@ -75,8 +59,6 @@ class CreateOrEditProblemSerializer(serializers.Serializer):
     memory_limit = serializers.IntegerField(min_value=1, max_value=1024)
     languages = LanguageNameMultiChoiceField()
     template = serializers.DictField(child=serializers.CharField(min_length=1))
-    rule_type = serializers.ChoiceField(choices=ProblemRuleType.choices)
-    io_mode = ProblemIOModeSerializer()
     visible = serializers.BooleanField()
     difficulty = serializers.ChoiceField(choices=Difficulty.choices)
     tags = serializers.ListField(child=serializers.CharField(max_length=32), allow_empty=False)

problem/views/admin.py

@@ -19,7 +19,7 @@ from utils.api import APIError, APIView, CSRFExemptAPIView, validate_serializer
 from utils.openai import get_ai_client
 from utils.shortcuts import natural_sort_key, rand_str
 
-from ..models import Problem, ProblemRuleType, ProblemTag
+from ..models import Problem, ProblemTag
 from ..serializers import (
     AddContestProblemSerializer,
     ContestProblemMakePublicSerializer,
@@ -195,14 +195,6 @@ class TestCaseAPI(CSRFExemptAPIView, TestCaseZipProcessor):
 class ProblemBase(APIView):
     def common_checks(self, request):
         data = request.data
-        if data["rule_type"] == ProblemRuleType.OI:
-            total_score = 0
-            for item in data["test_case_score"]:
-                if item["score"] <= 0:
-                    return "Invalid score"
-                else:
-                    total_score += item["score"]
-            data["total_score"] = total_score
         data["languages"] = list(data["languages"])
 
         # SQL 题校验：.sql 测试点与 .in/.out 沙箱判题互斥，SQL 必须是唯一语言