智教助手平台：完整初始化

- 前端：Vue3 + TS + Element Plus，24 个页面路由（课件/组题/教案/动画/思维导图/作文批改/命题/课堂/资源/社区等）
- 后端：FastAPI + SQLAlchemy + SQLite，17 个路由模块，AI 服务层含降级模板
- AI：glm-5.x 推理模型已禁用思维链，确保输出真实内容
- 修复：ai_service 两处请求体注入 enable_thinking/thinking disabled
- 测试账号：13900999999 / test1234

backend/schemas/chat.py

@@ -0,0 +1,41 @@
+from datetime import datetime
+from pydantic import BaseModel, Field
+
+
+class ConversationCreate(BaseModel):
+    title: str | None = Field(default=None, max_length=200)
+    subject: str = ""
+    grade: str = ""
+
+
+class ConversationRename(BaseModel):
+    title: str = Field(..., min_length=1, max_length=200)
+    pinned: bool | None = None
+
+
+class ChatSend(BaseModel):
+    content: str = Field(..., min_length=1, max_length=4000)
+    subject: str = ""
+    grade: str = ""
+
+
+class MessageOut(BaseModel):
+    id: int
+    role: str
+    content: str
+    created_at: datetime | None = None
+
+    model_config = {"from_attributes": True}
+
+
+class ConversationOut(BaseModel):
+    id: int
+    title: str
+    subject: str = ""
+    grade: str = ""
+    pinned: bool = False
+    created_at: datetime | None = None
+    updated_at: datetime | None = None
+    messages: list[MessageOut] = Field(default_factory=list)
+
+    model_config = {"from_attributes": True}