Add the Basileak design system (brand kit + README wiring)

[SchenLong]

What this adds

A complete design system for Basileak under brand/ — the single source of truth for the project's visual identity.

• Logo: a channel-split "B" lettermark + "BASILEAK" Orbitron wordmark (SVG masters + PNG/favicon exports).
• Tokens: brand/tokens/ — basileak.css (CSS vars + light mode), basileak.tailwind.js, basileak.tokens.json (W3C). Violet #8B5CF6 + cyan #00D9FF are the system layer; magenta #FF2D9B is reserved to mark the break.
• Iconography: 6 stage badges, 12 attack-category icons, 6 core glyphs (24 SVG masters from one registry).
• Components / diagrams / deck: component library; CTF-flow + taxonomy + architecture + data-mix + version diagrams (SVG + PNG); an OWASP-adapted deck (+ editable .pptx).
• Surfaces: social set, web heroes, the OWASP CMS project-page mockup, light-mode + motion specs, full brand guidelines.
• brand/owasp-cms/ stages the three CMS launch assets (512×512 logo, 1200×630 hero, CTF diagram) ready to upload.

The README gains a hero banner, the CTF-flow diagram, and a Brand & Design System section.

Notes

• Clean register on OWASP-facing chrome; the persona/loud register stays on social/CTF surfaces.
• OWASP co-brand wording is a swappable placeholder ("OWASP Project · Code / Breaker") pending confirmation.
• Public version on assets: R4.
• Binaries (*.pptx/*.pdf/*.jpg/*.webp) tracked via Git LFS.
• Internal design provenance is intentionally kept out of this public repo.

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