fix(cli): ignore comments in payment config summary

[WNZhao]

Summary

• mask line and block comments before parsing the payments configuration summary
• preserve quoted comment markers and source structure while scanning
• add regressions for comment-only examples and a commented example before the real block

Bug

sh1pt config payments parsed the first text matching payments: {, including examples inside // or /* */ comments. A commented sample could therefore produce a fake provider summary or shadow the live configuration.

Validation

• pnpm exec vitest run packages/cli/src/commands/config.test.ts --reporter=dot (6/6)
• standalone TypeScript check for config-payments.ts
• git diff --check

The workspace-wide CLI typecheck currently requires generated/built internal packages and fails on missing upstream workspace module declarations; the focused file check and repository CI cover this patch.