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.

mods/ftb-quests-forge.pw.toml

@@ -1,13 +0,0 @@
-name = "FTB Quests (NeoForge)"
-filename = "ftb-quests-neoforge-2101.1.36.jar"
-side = "both"
-
-[download]
-hash-format = "sha1"
-hash = "b2ede29b98a3022c22065fbe9b1761e385a28683"
-mode = "metadata:curseforge"
-
-[update]
-[update.curseforge]
-file-id = 8885017
-project-id = 289412

mods/ftb-teams-forge.pw.toml

@@ -1,13 +0,0 @@
-name = "FTB Teams (NeoForge)"
-filename = "ftb-teams-neoforge-2101.1.11.jar"
-side = "both"
-
-[download]
-hash-format = "sha1"
-hash = "62b65f752d0326edd13244e58d5f2aec035da4e9"
-mode = "metadata:curseforge"
-
-[update]
-[update.curseforge]
-file-id = 8724782
-project-id = 404468

mods/ftb-xmod-compat.pw.toml

@@ -1,13 +0,0 @@
-name = "FTB XMod Compat"
-filename = "ftb-xmod-compat-neoforge-21.1.12.jar"
-side = "both"
-
-[download]
-hash-format = "sha1"
-hash = "1f68bf714cf7ea3e07b23c6b8c1ebe516b325047"
-mode = "metadata:curseforge"
-
-[update]
-[update.curseforge]
-file-id = 8909889
-project-id = 889915