I Use this
https://mods.factorio.com/mod/enable-all-feature-flags
enabled feature_flags["spoiling"]

but cant Fridge be load .

oh yeah, the spoiling property only works in space-age because only the things on the agricultural planet will spoil.
I should make space-age a must-have dependencies

No, it can spoil without space-age

you should not make space-age a must-have dependencies.
and add a flag spoiling

that's all we need

let me see, the fridge mod modifies item.spoil_ticks which in the doc are space-age only attributes, you can see this image or this full doc.
but I have also see the spoiling feature so let me see what is happening.

https://mods.factorio.com/mod/enable-all-feature-flags

in your info.json
add

    "spoiling_required": true,

Then everything works fine without enabling space-age

okey, I found out that the reason it not starting is we use arguiculture sciense pack in the recipe. then it need to be adjusted, and because you show me the enable feature flags mod, we can know that some other mod will also use spoiling feature when not enable space-age dlc, so for better compatability, I will modify the recipe.

in the latest updates the problem was solved