fix:优化项目内容

backend/app/models.py

@@ -2,7 +2,6 @@ from datetime import date, datetime
 
 from sqlalchemy import (
     Date,
-    Column,
     DateTime,
     ForeignKey,
     Integer,
@@ -48,7 +47,6 @@ class Project(Base):
     created_at: Mapped[datetime] = mapped_column(
         DateTime(timezone=True), default=datetime.utcnow, nullable=False
     )
-
     customer: Mapped[Customer] = relationship("Customer", back_populates="projects")
     quotes: Mapped[list["Quote"]] = relationship(
         "Quote", back_populates="project", cascade="all, delete-orphan"
@@ -103,9 +101,10 @@ class FinanceRecord(Base):
     type: Mapped[str] = mapped_column(String(50), nullable=False)  # invoice / bank_receipt / manual / ...
     file_name: Mapped[str] = mapped_column(String(255), nullable=False)
     file_path: Mapped[str] = mapped_column(String(512), nullable=False)
+    tags: Mapped[str | None] = mapped_column(String(512), nullable=True)  # 逗号分隔标签
+    meta_json: Mapped[str | None] = mapped_column(Text, nullable=True)  # 结构化识别结果 JSON
     amount: Mapped[float | None] = mapped_column(Numeric(12, 2), nullable=True)
     billing_date: Mapped[date | None] = mapped_column(Date, nullable=True)
     created_at: Mapped[datetime] = mapped_column(
         DateTime(timezone=True), default=datetime.utcnow, nullable=False
     )
-