Release v1.0.0 — Angular 17.3+ support, npm publish setup & docs

Summary

First stable release of the NGXSMK UI kit. This PR bumps all packages to
1.0.0, widens Angular compatibility to 17.3+ (previously pinned to
Angular 22), and wires up the npm publish pipeline.

What's changed

Version & publishing

• Bumped @ngxsmk/cdk, @ngxsmk/core, @ngxsmk/theme (and root) to 1.0.0.
• Added publishConfig: { "access": "public" } and license: "MIT" to all
  three library packages.
• Updated the @ngxsmk/cdk peer range in @ngxsmk/core to ^1.0.0.
• Added npm run publish (builds libs, then publishes cdk → theme → core).

Angular 17.3+ compatibility

• Relaxed peer dependencies from ^22.0.0 → >=17.3.0.
• Fixed DOCUMENT imports: moved from @angular/core to @angular/common
  (valid in all versions; @angular/core only re-exports it from 19+).
• Added explicit standalone: true to 195 component/directive/pipe decorators
  (Angular 17/18 default to non-standalone, which broke imports/[(x)]).
• Fixed NgxsmkPagination: removed a redundant explicit pageChange output
  that conflicted with the model(page) change emitter (NG1054).

CI & tooling

• Added .github/workflows/compatibility.yml — builds the three libraries
  against Angular 17, 18, 19, 20, 21, and 22.
• Added tools/scripts/gen-ci-angularjson.mjs (generates a libs-only
  angular.json per major so the build is not blocked by demo/app builder
  schema differences).
• Added per-package tsconfig.json for ng-packagr auto-discovery.

Docs

• README: 17.3+ version note, verified/CI note, "Stable 1.0.0" status, Angular
  badge updated to 17.3+, and hero tagline v1.0.0 · Signals-native · Zoneless.
• Replaced the default Angular-CLI stub READMEs for cdk/core/theme with
  real package docs (compatibility, install, usage, publish path).
• Demo changelog page: added the v1.0.0 release entry.

Verification

All three publishable packages compile cleanly on Angular 17.3 (via the v17 CLI
builder) as well as 18–22. npm run build:libs is green on the repo's Angular
22 toolchain, and npm publish ./dist/ngxsmk/cdk --dry-run produces a valid
tarball.

Notes

• The published artifact is built with the lowest supported Angular so the
  partial-Ivy output stays forward-compatible.
• Publishing still requires npm login then npm run publish (not done here).