JBZoo / Mermaid-PHP / 29993003552

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feat(render): Remove jQuery and add opt-in self-hosting for Mermaid (#30)

The generated HTML unconditionally loaded jQuery and Mermaid from
third-party CDNs. When a visitor opened the page their IP was sent to
those hosts - a GDPR concern in the EU - and the page could not render
offline. This makes the external requests avoidable and lets consumers
keep everything on their own infrastructure, while the default behavior
stays unchanged.

- Removes the hardcoded jQuery CDN dependency entirely (zoom and path
highlighting are now native JS).
- Adds an opt-in `mermaid => [kind, source]` option to load Mermaid
three ways: `esm-url` (CDN, default), `umd-url` (self-hosted from your
own domain), or `umd-inline` (embedded into a single self-contained HTML
file for zero network requests). Legacy `mermaid_url` still works.
- Bumps the default Mermaid CDN to v11.

Public method signatures are unchanged; only the generated HTML differs
(no jQuery). Closes #9.

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