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/alembic/versions/d4e5f6a7b8c9_add_notifications_table.py

@@ -0,0 +1,41 @@
+"""add notifications table
+
+Revision ID: d4e5f6a7b8c9
+Revises: c3d4e5f6a7b8
+Create Date: 2026-07-22 11:00:00.000000
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+revision: str = 'd4e5f6a7b8c9'
+down_revision: Union[str, None] = 'c3d4e5f6a7b8'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        'notifications',
+        sa.Column('id', sa.Integer(), nullable=False),
+        sa.Column('user_id', sa.Integer(), nullable=False),
+        sa.Column('actor_id', sa.Integer(), nullable=True),
+        sa.Column('ntype', sa.String(length=32), nullable=False, server_default='comment'),
+        sa.Column('title', sa.String(length=200), nullable=False),
+        sa.Column('content', sa.String(length=500), nullable=False, server_default=''),
+        sa.Column('link', sa.String(length=255), nullable=False, server_default=''),
+        sa.Column('is_read', sa.Boolean(), nullable=False, server_default=sa.text('0')),
+        sa.Column('created_at', sa.DateTime(), server_default=sa.func.now(), nullable=True),
+        sa.ForeignKeyConstraint(['user_id'], ['users.id']),
+        sa.PrimaryKeyConstraint('id'),
+    )
+    op.create_index('ix_notifications_id', 'notifications', ['id'])
+    op.create_index('ix_notifications_user_id', 'notifications', ['user_id'])
+
+
+def downgrade() -> None:
+    op.drop_index('ix_notifications_user_id', table_name='notifications')
+    op.drop_index('ix_notifications_id', table_name='notifications')
+    op.drop_table('notifications')