Refactor for root-level en translations

[cbrinicombe13]

• Migrated canonical English docs from en/ into repo-root paths (using git mv) so default-language routes are unprefixed and file history is preserved.
• Updated docs.json English navigation paths to root-based routes and added legacy redirect support from /en/:slug* to /:slug*.
• Refactored localization scripts to support root source -> locale target mapping (instead of en/ source assumptions), including link localization, heading-anchor sync, OpenAPI title sync, and translation parity checks.
• Updated i18n.json bucket includes to match root-source file paths, keeping locale targets under es/ (and future locale dirs).
• Fixed relative import/media path depth in moved English MDX files so snippets, assets, and components resolve correctly after the directory shift.
• Updated translation validation workflow path filters to watch root content sections instead of en/**.
• Revised docs/rules (README.md, .cursor/rules/localization-workflow.mdc) to document root-source architecture and locale directory conventions.
• Resolved broken-link regressions from anchor drift by fixing stale fragments in EN/ES docs and replacing fragile OpenAPI #parameter-* deep links with stable endpoint links + inline parameter names.
• Added explicit id attributes for deep-linked accordion entries (mirrored across locales) to keep anchor links stable even when accordion titles are translated.
• Added a new guardrail script (scripts/validate-link-fragments.mjs) + CI step to block fragile #parameter-* links and enforce specific accordion-anchor safety checks.

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