增加代码知识库；修复文档处理内容；增加API设置

rag-web-ui/backend/app/models/model_config.py

@@ -0,0 +1,34 @@
+from sqlalchemy import Boolean, Column, DateTime, ForeignKey, Integer, String, Text
+from sqlalchemy.orm import relationship
+
+from app.models.base import Base, TimestampMixin
+
+
+class UserModelConfig(Base, TimestampMixin):
+    __tablename__ = "user_model_configs"
+
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False, index=True)
+    name = Column(String(255), nullable=False)
+    provider = Column(String(64), nullable=False, default="dashscope")
+    api_key = Column(Text, nullable=False)
+    api_base = Column(String(512), nullable=True)
+    chat_model = Column(String(128), nullable=False)
+    embedding_model = Column(String(128), nullable=False)
+    is_active = Column(Boolean, default=True, nullable=False, index=True)
+    last_used_at = Column(DateTime(timezone=True), nullable=True)
+
+    user = relationship("User", back_populates="model_configs")
+
+    @property
+    def has_api_key(self) -> bool:
+        return bool((self.api_key or "").strip())
+
+    @property
+    def api_key_masked(self) -> str:
+        value = (self.api_key or "").strip()
+        if not value:
+            return ""
+        if len(value) <= 10:
+            return "*" * len(value)
+        return f"{value[:4]}{'*' * 8}{value[-4:]}"