fix(create): make eslint scaffolds pass out of the box

[tannerlinsley]

Summary

• harden generated eslint config templates (React/Solid) to avoid known resolver/workspace-specific failures in fresh non-workspace apps
• disable problematic default rules for scaffolded starters (import/no-cycle, pnpm/json-enforce-catalog, and strict ordering/style rules that fail generated starter code)
• ignore eslint.config.js and prettier.config.js in generated lint runs to avoid parser project mismatch noise
• update shadcn React utility template to use top-level type import for ClassValue

Validation

• pnpm --filter @tanstack/create test
• scaffold repro app: --toolchain eslint --add-ons netlify,shadcn,tanstack-query
• in generated app: npm install && npm run lint (passes)

Fixes #148
Fixes #159

Release note

• intentionally no changeset in this PR; batching release entries together as requested