feat(pack): add 18 requested mods plus four required libraries

Content and QoL: Emotecraft, Ping Wheel, Nature's Compass, Farmer's Cutting:
Twilight Forest, Ars Nouveau's Flavors & Delight, Ocean's Delight, End's
Delight, Twilight's Flavor & Delight, Legendary Tooltips, Dynamic FPS,
Subtle Effects, Enchantment Descriptions, Entity Culling, Xaero Train Map,
Jade Sable Compat, Sable: Physics Compat, Apothic Category Compat,
Gravestone x Curios API Compat.

packwiz auto-resolved four required libraries that were not in the pack:
Iceberg and Prism (Legendary Tooltips), Prickle and Bookshelf
(Enchantment Descriptions).

Each pinned version was confirmed to be a NeoForge 1.21.1 build and each
jar's sha512 re-verified against its recorded hash. Sides are derived from
Modrinth's environment metadata; packwiz maps server_only to both on
purpose because such mods also work in singleplayer, where the client is
the logical server (dedicated_server_only is what yields "server").

Farmer's Cutting: Twilight Forest is published as a mod as well as a
datapack, and the neoforge mod variant is what gets pinned.

mods/bookshelf-lib.pw.toml

@@ -0,0 +1,13 @@
+name = "Bookshelf"
+filename = "bookshelf-neoforge-1.21.1-21.1.81.jar"
+side = "both"
+
+[download]
+url = "https://cdn.modrinth.com/data/uy4Cnpcm/versions/1sdJl7J1/bookshelf-neoforge-1.21.1-21.1.81.jar"
+hash-format = "sha512"
+hash = "78d4577a8e8fbb241216968475dd73f5b9e5efeb7da802b18a4e6c290e49af6cb4a5676e9855d0d8ff3613f967812e4bd363bbb9196c17c954d19454f84b2214"
+
+[update]
+[update.modrinth]
+mod-id = "uy4Cnpcm"
+version = "1sdJl7J1"