feat: 添加 Profile/Messages API 及 SSE 推送集成

- Profile API: GET/PUT /profile + PUT /profile/password
- Messages API: 模型/迁移(005)/服务/路由 + 任务操作自动创建消息
- SSE 推送集成: tasks.py 中 6 个操作触发 SSE 通知
- Alembic 迁移: 004 audit_logs + 005 messages
- env.py 导入所有模型确保迁移正确

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/app/models/__init__.py

@@ -12,6 +12,7 @@ from app.models.ai_config import AIConfig
 from app.models.review import ReviewTask, Platform
 from app.models.rule import ForbiddenWord, WhitelistItem, Competitor
 from app.models.audit_log import AuditLog
+from app.models.message import Message
 # 保留 Tenant 兼容旧代码，但新代码应使用 Brand
 from app.models.tenant import Tenant
 
@@ -45,6 +46,8 @@ __all__ = [
     "Competitor",
     # 审计日志
     "AuditLog",
+    # 消息
+    "Message",
     # 兼容
     "Tenant",
 ]

backend/app/models/message.py

@@ -0,0 +1,45 @@
+"""
+消息/通知模型
+"""
+from typing import Optional
+from sqlalchemy import String, Boolean, Text, ForeignKey, Index
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.models.base import Base, TimestampMixin
+
+
+class Message(Base, TimestampMixin):
+    """消息表"""
+    __tablename__ = "messages"
+
+    id: Mapped[str] = mapped_column(String(64), primary_key=True)
+
+    # 接收者
+    user_id: Mapped[str] = mapped_column(
+        String(64),
+        ForeignKey("users.id", ondelete="CASCADE"),
+        nullable=False,
+    )
+
+    # 消息类型: invite, new_task, pass, reject, appeal, system 等
+    type: Mapped[str] = mapped_column(String(50), nullable=False)
+
+    # 消息内容
+    title: Mapped[str] = mapped_column(String(255), nullable=False)
+    content: Mapped[str] = mapped_column(Text, nullable=False)
+
+    # 已读状态
+    is_read: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
+
+    # 关联信息（可选）
+    related_task_id: Mapped[Optional[str]] = mapped_column(String(64), nullable=True)
+    related_project_id: Mapped[Optional[str]] = mapped_column(String(64), nullable=True)
+    sender_name: Mapped[Optional[str]] = mapped_column(String(100), nullable=True)
+
+    __table_args__ = (
+        Index("idx_messages_user_id", "user_id"),
+        Index("idx_messages_user_read", "user_id", "is_read"),
+    )
+
+    def __repr__(self) -> str:
+        return f"<Message(id={self.id}, user_id={self.user_id}, type={self.type})>"