Steamon : Cobblemon x Create

Fix the Create World crash, strip the pack down, sync server to client

• Found and fixed the real cause of the recurring IndexOutOfBoundsException crash on the Singleplayer/Create World screen: two custom recipes (tm_blank_create.json, tr_blank_create.json) referenced items from SimpleTMs, a mod declared side = "both" but only ever added to the server. On the client those items silently resolved to air, leaving a Create sequenced-assembly step with zero ingredients.
• Stripped the pack down to just mods, resourcepacks, shaderpacks and mod config: removed the whole steamon-tweaks custom datapack (arenas, trainers, custom loot tables, spawn tuning) and the KubeJS badge/starter kit/compensation scripts, on both client and server.
• Removed Open Parties and Claims and its three server addons, plus a long list of unused or redundant mods (Construction Sticks, Berry Harvester, Crawl, Create Nuclear, Create: Vibrant Vaults, Lootrmon, Retraining, Runelic, Create: Ochrum Recipe, Waystones Teleport Pets, Traveler's Titles, Xaero's Waystones Compatibility, Cobblemon Move Inspector, MoreCobblemonTweaks, Pet Your Cobblemon, Resource Pack Overrides, and server-only stragglers Cobblemon CobbleStats, Create: Connected, EnchantmentLevelBreak, Immersive Aircraft). Verified none of them were a dependency of a mod that's staying, and Konkrete was kept since FancyMenu and JustZoom both require it.
• Added Chalk, Dense Ores, Only Hammers and Excavators, Dynamic Surroundings, Mechanical Healing Machine and Cobblemon Gym Badges.
• Fixed a separate crash: the Fully Hisuian Starters resourcepack shipped a Rowlet Hisuian model missing a part Cobblemon 1.8.1 expects.
• The server pack had drifted badly behind the client: 62 shared mods were on stale versions, including Cobblemon itself (1.7.3 server vs 1.8.1 client), a gap wide enough to likely break client/server connections. Brought every shared mod, config file and datapack up to match the client, and cleaned up composition drift in both directions (removed leftover Create Encased/WorldEdit entries and server-only strays, added Tectonic/Terralith/Feature Recycler to the server so a dedicated server generates the same terrain as singleplayer).
• Set medium default graphics settings for 8 GB RAM systems (render distance 10->8, simulation distance 10->6, fast graphics, decreased particles) with shaders off by default.
• Rewrote the README and the Modrinth/CurseForge descriptions.