feat: add BridgeInterfaceInfo and BridgeInfo models with descriptions

backend/src/network_api.py

@@ -79,12 +79,18 @@ class RouteInfo(BaseModel):
     )
 
 class BridgeInterfaceInfo(BaseModel):
+    """
+    Represents a network interface which is a member of an bridge.
+    """
     ifindex: int = Field(..., description="Interface index of a bridge member")
     ifname: str = Field(..., description="Interface name of a bridge member")
     state: Optional[str] = Field(None, description="Operational state of the interface")
     mtu: Optional[int] = Field(None, description="MTU of the interface")
 
 class BridgeInfo(BaseModel):
+    """
+    Represents a network bridge interface with all its properties.
+    """
     ifindex: int = Field(..., description="Interface index of the bridge")
     ifname: str = Field(..., description="Bridge interface name")
     state: Optional[str] = Field(None, description="Operational state of the bridge")