Add <lit-isoflow> to Real World / Components

[eviltik]

Adds <lit-isoflow> under Real World → Components, in alphabetical order.

A viewer and editor for isometric infrastructure diagrams — a React-free port of Isoflow/FossFLOW as a single Lit element. Upstream is a React app (React, MUI, zustand, immer, gsap, react-quill), so it cannot be embedded outside React; this keeps the isometric projection, the A* connector routing and the model format (JSON, interchangeable with Isoflow/FossFLOW), and rewrites the view layer as a custom element. Three runtime dependencies: lit, zod, pathfinding.

Notable beyond "another wrapper":

• A DOM-free SVG renderer ships alongside the element (lit-isoflow/render), sharing its geometry engine — so the same diagram renders identically in the browser and in a Node pipeline (PDF, docs, CI), with no headless browser.
• Three modes on one element: viewer, editor, and static rendering.
• MIT, live demos, unit tests in CI, integration guide, published as lit-isoflow on npm.

There is currently no diagramming component in the list, so this fills a gap rather than duplicating an entry.