chore(pack): drop FTB Quests, FTB Teams and FTB XMod Compat

FTB Teams was the only thing holding FTB Quests down -- FTB Quests' 1.21.1
build requires it, and its bytecode references dev/ftb/mods/ftbteams in 14
classes including the event handler, so it breaks at runtime without it. With
quests unused, the whole block goes. XMod Compat only bridged
Quests/Chunks/Ranks, all of which are now gone.

FTB Library stays because FTB Backups 3 builds its config UI on it
(Panel/Theme/Widget/ConfigGroup/ConfigValue/SNBTCompoundTag, 13 classes, and
it does not bundle them despite declaring only neoforge). Architectury API
stays because FTB Library references it in 47 classes.

Verified before removing: FTB Library and FTB Backups 3 reference ftbteams,
ftbquests and ftbxmodcompat in zero classes each, and nothing else in the pack
references them.

CurseForge-sourced mods drop from 9 to 5; pack is 146 mods. OPAC's built-in
party system is now the only one, so primaryPartySystem should be left at its
default rather than pointed at ftbteams.

index.toml

@@ -305,21 +305,6 @@ file = "mods/ftb-library-forge.pw.toml"
 hash = "2e72d40c6d7b128981b19b71c19d45eb6813f1af87ae1abe1cf92adfa5e8223f"
 metafile = true
 
-[[files]]
-file = "mods/ftb-quests-forge.pw.toml"
-hash = "93330f6ec85532067df176c6baee0e0f6d685c78088b1a2217726f6421899148"
-metafile = true
-
-[[files]]
-file = "mods/ftb-teams-forge.pw.toml"
-hash = "c21c2308684a75cda7dd9d557d129c9f89f49be527da3d5aa675fff444c11f5e"
-metafile = true
-
-[[files]]
-file = "mods/ftb-xmod-compat.pw.toml"
-hash = "6ad22c468d67dcbb65784e161d4af9e671d3437cb5bfb1e86a42ae25207cf25b"
-metafile = true
-
 [[files]]
 file = "mods/fusion-connected-textures.pw.toml"
 hash = "7411c38665af0ee0b17613ac80daaa040a5f59b046d418421297acf2c6fa8c9c"