Introduce KFE icons studio demo and initialize desktop renderer

[pphatdev]

Description

This PR introduces the KFE Icons Studio demo and development environment to the repository. The studio provides an interactive, web-based workspace for previewing, manipulating, inspecting, and managing icon definitions within @pphatdev/registry.

What changes are included in this PR?

• Icon Studio Web App: Launched interactive UI tools and a local server for exploring and testing both brands/ and regular/ icon sets.
• SVG Editing & Cleaning Capabilities: Included tools to strip inline styles, remove wrapper <g> and <defs> tags, adjust viewports to standard 48x48 dimensions, and enforce currentColor / 0.1 background opacity standards.
• Developer Workflow Infrastructure: Integrated demo preview server infrastructure to streamline testing before icon JSON definitions are committed.

Answers to Template Questions

• What icon/feature are you adding? KFE Icons Studio — an interactive demo application & development environment for icon visualization and manipulation.
• Where did the changes come from? Internal tooling development for @pphatdev/registry.
• Is this fixing an existing icon? No — new development feature and preview environment tooling.

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Checklist

• I have placed my new or updated .json icon file in the correct category directory (brands/ or regular/).
• My file uses a lowercase name with hyphens for spaces (e.g., my-brand.json).
• I have NOT manually edited the root brands.json or regular.json files (our GitHub Actions workflow will handle this automatically!).
• My JSON configuration is valid and follows the schema.
• I have read the CONTRIBUTING.md guide.