Fix deploy-site failure by removing broken fmin package-root import in Venn layout

[Copilot]

The deploy-site GitHub Actions job failed during docs bundling because fmin resolved to a module with no named exports in that toolchain. Venn layout imported named symbols (bisect, zerosM, etc.) from fmin, causing webpack compile errors in site build.

• Root cause addressed

  • Replaced Venn layout’s direct dependency on fmin package-root exports, which are not reliable in the deploy/docs bundling path.

• Code changes

  • Added a local compatibility module at src/plots/venn/layout/fmin.ts implementing only the required helpers used by Venn layout:
    • bisect
    • zeros, zerosM
    • norm2, scale
    • conjugateGradient (with internal line search helpers)
  • Updated src/plots/venn/layout/layout.ts to import these helpers from ./fmin instead of fmin.

• Behavioral scope

  • Change is isolated to Venn layout internals; public plot APIs and call sites remain unchanged.
  • Error handling in bisect now throws Error for consistent exception semantics.

// before
import { bisect, conjugateGradient, norm2, scale, zeros, zerosM } from 'fmin';

// after
import { bisect, conjugateGradient, norm2, scale, zeros, zerosM } from './fmin';

[hustcc]

@copilot 继续修复 ci https://github.com/antvis/G2Plot/actions/runs/35502196164/job/106058603366?pr=3888

[Copilot]

@copilot 继续修复 ci https://github.com/antvis/G2Plot/actions/runs/35502196164/job/106058603366?pr=3888

已继续修复这个 CI 问题：src/plots/venn/layout/fmin.ts 中将未被重新赋值的 pk 从 let 改为 const，解决了 prefer-const 报错。修复提交：bfa9c92。