fix(dev-runtime): honor gitignore in snapshots

[iroiro147]

Summary

• honor app .gitignore entries while copying dev-runtime source snapshots
• scope .gitignore matching to the app root so app build ignores do not drop required workspace package artifacts
• keep the existing built-in snapshot skips, upstream nested-git boundary skip, and app-root build/dist skips intact
• add integration regressions for ignored vector-store data, negation, nested file skips, and linked workspace package dist preservation

Tests

• pnpm --filter eve run build:js
• pnpm --filter eve exec vitest run --config vitest.integration.config.ts src/internal/nitro/dev-runtime-artifacts.integration.test.ts
• pnpm exec oxlint packages/eve/src/internal/nitro/dev-runtime-source-snapshot-copy.ts packages/eve/src/internal/nitro/dev-runtime-artifacts.integration.test.ts
• pnpm exec oxfmt --check packages/eve/src/internal/nitro/dev-runtime-source-snapshot-copy.ts packages/eve/src/internal/nitro/dev-runtime-artifacts.integration.test.ts .changeset/tame-lance-snapshots.md
• git diff --check -- packages/eve/src/internal/nitro/dev-runtime-source-snapshot-copy.ts packages/eve/src/internal/nitro/dev-runtime-artifacts.integration.test.ts .changeset/tame-lance-snapshots.md

Refs #652

[vercel]

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[vercel]

gitIgnorePatternToRegExp mishandles ** because it emits the adjacent / separator literally, so leading/mid **/ patterns require at least one directory segment and fail to match top-level entries.