add bn128 encode & fix inputs name

[wiasliaw]

Close #324.

[vercel]

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[2xic]

thank you! Just a minor comment

[cursor]

PR Summary

Revamps 0x08 precompile docs to detail bn128 G1/G2 encoding, rename inputs to explicit component fields, and add an example with playground link.

• Docs (precompile 0x08, Byzantium bn128 pairing):
  • Clarify encoding for G_1 over F_p and G_2 over F_{p^2} (including point-at-infinity encoding).
  • Update inputs schema: rename from x1/y1/x2/y2/x3/y3 to explicit components g1_x, g1_y, g2_x_c1, g2_x_c0, g2_y_c1, g2_y_c0; emphasize inputs are multiples of 6×32 bytes.
  • Add example input/output and a playground reproduction link.

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[wiasliaw]

@2xic
I had fixed the comment.
feel free for any comment