chore: 将后端移动到 api/ 目录，准备合并为单仓库

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

api/task/schemas.py

@@ -0,0 +1,99 @@
+from datetime import datetime
+from typing import Optional
+from ninja import Schema, ModelSchema
+from .models import Tutorial, Challenge
+
+
+class TutorialSlim(Schema):
+    display: int
+    title: str
+    is_public: bool
+
+
+class TutorialAll(ModelSchema):
+    class Meta:
+        model = Tutorial
+        fields = "__all__"
+
+
+class TutorialIn(Schema):
+    display: int
+    title: str
+    content: str
+    is_public: bool = False
+    example_html: Optional[str] = None
+    example_css: Optional[str] = None
+    example_js: Optional[str] = None
+
+
+class ChallengeSlim(Schema):
+    display: int
+    title: str
+    score: int
+    pass_score: Optional[float] = None
+    is_public: bool
+    author_name: Optional[str] = None
+
+
+class ChallengeDisplay(ChallengeSlim):
+    submitted: bool
+
+
+class ChallengeAll(ModelSchema):
+    author_name: Optional[str] = None
+
+    class Meta:
+        model = Challenge
+        fields = "__all__"
+
+
+class ChallengeIn(Schema):
+    display: int
+    title: str
+    content: str
+    score: int = 0
+    is_public: bool = False
+    example_html: Optional[str] = None
+    example_css: Optional[str] = None
+    example_js: Optional[str] = None
+
+
+class CreationSlim(Schema):
+    display: int
+    title: str
+    content: str
+    created: datetime
+    modified: datetime
+    has_code: bool
+
+    @staticmethod
+    def resolve_has_code(obj):
+        return bool(obj.html or obj.css or obj.js)
+
+
+class CreationOut(Schema):
+    task_id: int
+    display: int
+    title: str
+    content: str
+    html: str
+    css: str
+    js: str
+    owner_name: str
+    created: datetime
+    modified: datetime
+
+    @staticmethod
+    def resolve_task_id(obj):
+        return obj.pk
+
+
+class CreationIn(Schema):
+    title: str
+    content: str = ""
+
+
+class CreationCodeIn(Schema):
+    html: str = ""
+    css: str = ""
+    js: str = ""