RLCraft Improved Backpacks

[1.0.10] - 2026-05-28
- Fixed crash when breaking a placed backpack: NoSuchMethodError BlockPos.getX()I
  in WBHooks.persistPlacedBackpack (regression from v1.0.6).
  Root cause: pos.getX/Y/Z() compiled with BlockPos as the bytecode owner class.
  SpecialSource tsrg maps Vec3i.getX → func_177958_n (declaring class) but not
  BlockPos.getX → BlockPos is not the declaring class → call-site not renamed →
  NoSuchMethodError at runtime in obfuscated MC.
  Fix: cast pos to Vec3i before calling getX/Y/Z so the bytecode owner is Vec3i
  and SpecialSource remaps the call correctly.
- Reordered upgrade tier chain: NORMAL → IRON → GOLD → COPPER → BRONZE → SILVER
  → DIAMOND → OBSIDIAN → ENCHANTED. Vanilla materials (iron, gold, diamond, obsidian)
  now come before mod-dependent materials (copper, bronze, silver from Ice and Fire /
  Varied Commodities), making progression viable in RLCraft instances without those mods.
- Redesigned tier stats to maintain progressive improvement with the new order:
    IRON:     9×4, 36 slots, stackCap 64,  unstackableCap 2, baubleSlots 0
    GOLD:     9×4, 36 slots, stackCap 70,  unstackableCap 3, baubleSlots 1
    COPPER:   9×5, 45 slots, stackCap 72,  unstackableCap 4, baubleSlots 0
    BRONZE:   9×5, 45 slots, stackCap 80,  unstackableCap 5, baubleSlots 0
    SILVER:   9×6, 54 slots, stackCap 90,  unstackableCap 6, baubleSlots 0
  Diamond and above unchanged. Dynamic tier skip continues to work with the new order:
  if Ice and Fire is absent, COPPER/BRONZE/SILVER are skipped and GOLD upgrades directly
  to DIAMOND.
- Inventory preview (Shift+Tab) now available from IRON tier (was COPPER).