docs(readme): point example-source links at the root showcase - #67

Summary

The showcase moved from versions/v19/projects/showcase to the root showcase/ workspace on 2026-08-06. The README example-source links still pointed at the old path, so they returned 404 on GitHub and on the npm package page. This PR points them at showcase/src/app/pages/<category>/<slug>/<slug>-demo.component.ts. It also removes the last stale reference to the old path, which was in the workspace ESLint config.

#66 fixed the same stale path in the showcase "View demo source" links. This PR covers the READMEs.

Changes

• README.npm.md (canonical npm README): the Button, Input, Table and Persistence links use absolute https://github.com/sdcorejs/sdcorejs-angular/blob/main/showcase/src/app/pages/... URLs.
• README.md (GitHub landing): the 8 example links in "Explore the library" and "Examples and documentation" use relative showcase/src/app/pages/... paths.
• versions/v{19,20,21,22}/projects/sdcorejs-angular/README.md: rolled out from README.npm.md with npm run sync, not edited by hand.
• versions/v{19,20,21,22}/eslint.config.js: removed the dead projects/showcase/src/app/docs/generated/**/*.ts ignore and its comment. The lint target only covers projects/sdcorejs-angular, so nothing matched that ignore. The pdf worker ignore stays. v20, v21 and v22 come from npm run sync.
• .sdcorejs/summary.md: the showcase source root is now showcase.

Each edited table row keeps its width, so the Markdown tables stay aligned. I did not run Prettier over the whole READMEs, because both files already have unrelated table drift that it would reformat.

published-docs/** and published-pages/** are untouched, because they are archived release artifacts.

Verification

Local runs used Node 22.22.3 on the exact committed diff:

• npm run check:sync: passed ("v20, v21, v22 match v19").
• All 28 showcase links in the six READMEs resolve to tracked files under showcase/src/app/pages/. No README mentions projects/showcase any more.
• ESLint 9 Node API: all four eslint.config.js files load. pdf-worker-inline.generated.ts is still ignored, and library files are still linted with prettier/prettier.
• npm run test:check-scss-hex: 9/9 passed. This test lints with the v19 ESLint config.
• Prettier 3.8.3 --check: the four ESLint configs and .sdcorejs/summary.md pass.
• npm run sync also rewrote 1163 v22 files with CRLF line endings only and bumped the four SYNC-STATUS.md timestamps. I restored those files, so the diff holds only the 11 intended files.

Not run locally: test:theme and test:theme-token-list need versions/v19/node_modules for their sass load paths, and this worktree has no node_modules. Neither test reads a changed file. CI runs both, and it also runs lint and the full ng test suite.

Risks and rollback

This PR changes only docs and lint config. There are no changes to library code, public API or package versions. To roll back, revert the two commits.

Notes for reviewer

• There is no CHANGELOG entry. If you want one, it can go under ## [Unreleased] next to the fix(showcase): point "View demo source" links at the root showcase #66 showcase entry.
• .sdcorejs/summary.md is still an older snapshot elsewhere: it lists only v20/v21 and release 1.4. A full refresh is out of scope.

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