Add and correct 26.1 protocol and registry mappings

[Mikulasz12]

Summary

This PR brings the existing 26.1 data branch onto master and adds the follow-up fixes needed to make 26.1 decode.

What changed

• merges the existing pc_26_1 data work into master
• fixes the 26.1 dataPaths wiring
• adds corrected 26.1 data for:
  • blocks
  • items
  • blockCollisionShapes
• updates the 26.1 protocol mappings

Why

The initial 26.1 data branch was enough to get protocol and version support in place, but some 26.1 registry data had drifted.

In practice that meant clients could connect, but some ids decoded incorrectly. For example:

• iron_bars came through as copper_bars
• soul_lantern came through as copper_lantern
• blockAt() read a placed soul_lantern as crimson_pressure_plate

Verification

Tested with a Mineflayer bot using version: "26.1" against a vanilla server.

Checked that:

• inventory items decoded correctly
• placed blocks read back correctly

Examples verified:

• iron_bars
• soul_lantern
• oak_planks