Darenfell 0.1.42.3 — Identifier Audit Hotfix

Scope: identifier corrections only. No intentional balance/behavior tuning.

Verified against exact pack JARs:
- Iron's Spells 'n Spellbooks 1.1.4.5
- Ice & Fire 2.1.12
- Ice & Fire / Terralith Compat 1.0.2
- Apotheosis 5.8.1
- previously supplied Simply Swords, Twilight Forest, Blue Skies, Undergarden, Nexus, Astral JARs

Corrections:
- irons_spellbooks:chests/additional_good_loot -> irons_spellbooks:chests/generic_magic_treasure
- irons_spellbooks:chests/additional_treasure_loot -> irons_spellbooks:chests/additional_generic_loot
- irons_spellbooks:chests/additional_end_city_loot -> irons_spellbooks:chests/generic_magic_treasure
- Removed invalid irons_spellbooks:druidic_spell_book route; that item/resource does not exist in Iron's Spells 1.1.4.5.

Validation findings:
- Ice & Fire IDs used by Layer 1 / Apotheosis resolve against 2.1.12.
- Apotheosis enchantment IDs in config resolve against 5.8.1.
- Equipment Type Override item IDs for currently available exact JARs resolve.
