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/models/community.py

@@ -0,0 +1,54 @@
+from sqlalchemy import Column, Integer, String, Text, DateTime, JSON, ForeignKey, UniqueConstraint
+from sqlalchemy.orm import relationship
+from sqlalchemy.sql import func
+from database import Base
+
+
+class Post(Base):
+    __tablename__ = "posts"
+
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+    title = Column(String(200), nullable=False)
+    content = Column(Text, default="")
+    post_type = Column(String(50), default="discussion")
+    tags = Column(JSON, default=list)
+    attachments = Column(JSON, default=list)
+    views = Column(Integer, default=0)
+    likes = Column(Integer, default=0)
+    comments_count = Column(Integer, default=0)
+    is_pinned = Column(Integer, default=0)
+    created_at = Column(DateTime, server_default=func.now())
+    updated_at = Column(DateTime, server_default=func.now(), onupdate=func.now())
+
+    author = relationship("User", back_populates="posts")
+    comments = relationship("Comment", back_populates="post", lazy="selectin", cascade="all, delete-orphan")
+    favorites = relationship("PostFavorite", back_populates="post", lazy="selectin", cascade="all, delete-orphan")
+
+
+class Comment(Base):
+    __tablename__ = "comments"
+
+    id = Column(Integer, primary_key=True, index=True)
+    post_id = Column(Integer, ForeignKey("posts.id"), nullable=False)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+    content = Column(Text, nullable=False)
+    parent_id = Column(Integer, ForeignKey("comments.id"), nullable=True)
+    likes = Column(Integer, default=0)
+    created_at = Column(DateTime, server_default=func.now())
+
+    post = relationship("Post", back_populates="comments")
+    author = relationship("User")
+
+
+class PostFavorite(Base):
+    __tablename__ = "post_favorites"
+    __table_args__ = (UniqueConstraint("user_id", "post_id", name="uq_post_favorite_user_post"),)
+
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False, index=True)
+    post_id = Column(Integer, ForeignKey("posts.id"), nullable=False, index=True)
+    created_at = Column(DateTime, server_default=func.now())
+
+    user = relationship("User")
+    post = relationship("Post", back_populates="favorites")