feat(ui): integrate pccx-UI theme and logo

[hkimw]

Refs #124.

Summary:

• Adds copied pccx aperture logo assets and sets the local VS Code prototype extension icon.
• Adds a pccx SystemVerilog Light color theme using the pccx-UI palette and SystemVerilog token colors.
• Adds a copied-asset notice because the local pccx-UI source package has no LICENSE or NOTICE file.

Validation:

• bash scripts/vscode-adapter-smoke.sh
• node editors/vscode-prototype/test/static-boundary.test.mjs
• node editors/vscode-prototype/test/extension-manifest.test.mjs
• python3 scripts/check-source-headers.py
• python3 -m compileall -q src tests scripts
• node --check over editors/vscode-prototype src/test/bin JS files

Scope guard:

• Visual branding and theme contribution only.
• No command allowlist changes, raw shell execution changes, KV260 control, LSP scope change, publishing metadata, or stable API/ABI claim.