Introduce a new Fractal visualization: adds FractalComponent (template, styles, TS), FractalService (rendering, palettes, Mandelbrot/Julia/Burning Ship/Newton implementations), and Fractal model/types. Wire up routing and router constants (route and component import), add wiki links to UrlConstants, and expose the new algorithm in AlgorithmsService. Also add i18n entries (en/de) for UI labels and explanations. Component supports canvas zoom/drag, color schemes and iteration controls.
