🤖 feat: migrate static S3 storage to Cloudflare R2 and add multi-locale SSG support (#70)

## Summary

- **Cloudflare R2 Migration**:
- Migrated `static.ermnvldmr.com` asset storage to Cloudflare R2 bucket
`com-ermnvldmr-static` (location `WEUR`).
- Added support for `COM_ERMNVLDMR_STATIC_PUBLIC_URL` fallback in
`@ermnvldmr/cli` to properly format public asset URLs for non-dotted
bucket names.
- Relocated public CA cert to
`/dev/ssl/certs/ErmnvldmrDevelopmentRootCA.pem` and updated
`REMOTE_ROOT_CA_URL` references in `@ermnvldmr/rsbuild-config` and
`ensure-dev-certs.mjs`.
- Configured R2 CORS policies using wildcards
(`https://*.ermnvldmr.com`, `https://ermnvldmr.com`,
`https://localhost.ermnvldmr.com*`, `http://localhost*`,
`https://direct.yandex.ru`, `https://*.direct.yandex.ru`,
`https://localhost.yandex.ru*`).
  - Enforced minimum TLS 1.2 on zone `ermnvldmr.com`.
- Updated encrypted `.env.dev` and GitHub secrets in both
`deytenit/ermnvldmr.com` and `deytenit/apex.ermnvldmr.com`.

- **Multi-locale SSG Support**:
- Added `NormalModuleReplacementPlugin` to SSR runner in
`@ermnvldmr/ssg` for automatic `.en.mdx` -> `.${locale}.mdx`
substitution during Russian builds.
- Added page metadata extraction (`getPageOptions`) in `@ermnvldmr/ssg`
for pre-rendered `<title>` and `<meta name="description">` tags.
- Added unit test suite for `createPage` and updated `services/www`
build scripts (`build:all`, `build:en`, `build:ru`, `dev:en`, `dev:ru`).

ci/scripts/ensure-dev-certs.mjs

@@ -162,7 +162,7 @@ export function loadDevRootCaKey(workspaceRoot = findWorkspaceRoot()) {
  * Remote public URL for the Ermnvldmr development root CA certificate.
  */
 export const REMOTE_ROOT_CA_URL =
-  'https://static.ermnvldmr.com/ssl/certs/ErmnvldmrDevelopmentRootCA.pem';
+  'https://static.ermnvldmr.com/dev/ssl/certs/ErmnvldmrDevelopmentRootCA.pem';
 
 /**
  * Ensures valid development certificates exist for localhost.ermnvldmr.com.