How do you imagine the healing/mana potion system to balance the PvP?

NPC sell cheap weak pots, while craftables are stronger.
Mobs drop resources for it.
Cheap ones are weak, expensive are better
Sellable only in scientific nodes or from players
Regen over time and suuuper rare and expensive instant ones
CD of 5 secs between regen timers and instant ones are instant cd
Almost no weight, but limited quantity (especially the instant ones)
Identical for all
No vial, so that it's a resource sink
No interrupts, but any "decrease incoming healing(mana regen)" debuffs apply to potion regen
Yes, at least 3 sizes
No use for others
Potion should be considered a separate casted ability
All kinds of basic stat buffs, but for a fairly short time and a fairly small boost. Also elemental resistance pots
Yeah, I think a separate key should be fine

I'd want this potions design.

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The ttk is already 30+ seconds. That's long as fuck, especially if you consider any counters and proper movements/actions.

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Both archers and mages should have lower defense stats to counterbalance their dps output. So if that fighter or other melee class gets up to the ranged attackers - it immediately lowers the probability of the ranged character winning.

But even outside of that, classes will have different gap closers to prevent exactly the thing you're talking about. Healing potions have barely anything to do with that.

With instant or short cd pots those ranged classes can just kite melees for as long as they want and keep healing any dmg in the meantime. L2 had quite the problem with instant potions because of that.

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Yeah, there's a ton of fun stuff that can be done with potions, but until we learn more about alchemy it's hard to say what would fit Ashes and what wouldn't.

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30+ sec ttk would most likely mean smth like 1-2min ttk in party play. With resurrections and proper healing one fight could go on for even longer. That would mean 1-2 uses of a 5min cd potion.

Here's an example of a party vs party pvp from L2. The game had a faster ttk, but that's counterbalanced against AoC's ttk with CP potions (the yellow bar).
https://www.youtube.com/watch?v=L1M1H_Nfsx0

Almost 10 minutes to wipe out archers as mages. Potions have 5min cd (top row, 7-9 position). 2 uses. Fighters are thicker and their party composition would reinforce that feature even more, so the pvp would be even longer.

10min cd pots in Ashes could, in theory, restore % based values instead of flat ones, so that their power was bigger and justified the long cd.