refactor(pack): host custom jars from ./custom outside the pack root

Move pack/custom/ -> ./custom/ and bind-mount it into caddy at
/srv/pack/custom (served URL pack.${BASE_DOMAIN}/custom/ unchanged).
Keeping jars outside the packwiz pack root stops `packwiz refresh`
from indexing them as direct files on top of the mods/*.pw.toml
external refs (drops 9 bogus custom/*.jar entries from index.toml).

add-custom-mod.sh now writes jars to ./custom/. Trim the blessingskin
caddy override to just the conf swap (volumes merge by target).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

pack/index.toml

@@ -2,48 +2,12 @@ hash-format = "sha256"
 
 [[files]]
 file = "CustomSkinLoader/CustomSkinLoader.json"
-hash = "e90635e0074cc7b1ddee50ddd2af8a4b35842ab721878665b00a3612ad01105b"
+hash = "20f015b837d4178cc1ba6ca074e746dea91b2b97810587bae0fc4e55cf98b1aa"
 
 [[files]]
 file = "README.md"
 hash = "3915be75668def5a70667584c7aebdc1ee9a7f7dd9479cb10fb174aad40a6b4e"
 
-[[files]]
-file = "custom/CustomSkinLoader_Universal-14.28.jar"
-hash = "0008fb0a91dd1e84d52162cfe96addb5f6aed3b76d426ea7305d7624e31f1894"
-
-[[files]]
-file = "custom/Jade-1.21.1-NeoForge-15.10.5.jar"
-hash = "067bb4b007e1d6f6b79f0afe99c91252aa825472b99a76d33a60d24442f9e92d"
-
-[[files]]
-file = "custom/JadeAddons-1.21.1-NeoForge-6.1.0.jar"
-hash = "5f242668ad710092964d4d9afda8a94fa2401665ea13eea67d55d07e4dff8a64"
-
-[[files]]
-file = "custom/JustEnoughProfessions-neoforge-1.21.1-4.0.5.jar"
-hash = "b320b47f1791f56df9e1a05138f0e312e6e54541945ff15f2f1fd398cd1d4d9d"
-
-[[files]]
-file = "custom/JustEnoughResources-NeoForge-1.21.1-1.6.0.17.jar"
-hash = "7a47d69b5530704690d5a5f0726cd74a2d6c57df17dd4a8589c4ab5212f91460"
-
-[[files]]
-file = "custom/MouseTweaks-neoforge-mc1.21-2.26.1.jar"
-hash = "68e6f4201c5de97b77929a7215c9552495696ca6a3bf3ae4eacc34e135f6cc8b"
-
-[[files]]
-file = "custom/balm-neoforge-1.21.1-21.0.58.jar"
-hash = "aa2463747bad4c2351869226ea7bce7839510dfd2ac387f8d1588b1ce9309c67"
-
-[[files]]
-file = "custom/inventoryessentials-neoforge-1.21.1-21.1.15.jar"
-hash = "b7a5c5526a45256551543419ba2b5d54e56c585d76a645a8cea8cb8ea843ae2c"
-
-[[files]]
-file = "custom/jei-1.21.1-neoforge-19.27.0.340.jar"
-hash = "8aaf547432f1b4958239b036356b910692fe40f858c3073d996f56bbf7c99826"
-
 [[files]]
 file = "mods/balm-neoforge-1-21-1-21-0-58.pw.toml"
 hash = "4d04516cc66ac6f29d6d1ae16bfd89217f21d842858ace5bcae1e402da5da0e2"

pack/pack.toml

@@ -6,7 +6,7 @@ pack-format = "packwiz:1.1.0"
 [index]
 file = "index.toml"
 hash-format = "sha256"
-hash = "64c69b2e38fcf389a3de38d240aa95e8309ac60e717c1fe994aef2c4a2684921"
+hash = "2707ae674c7c75371b97cc378ca72abc36bbb513b7db238db111f88a13aa6039"
 
 [versions]
 minecraft = "1.21.1"