Initial commit: Publisher dashboard monorepo

Turborepo + Bun monorepo with:
- apps/publisher-dashboard: Svelte 5 SPA with SvelteKit, Tailwind CSS v4, shadcn-svelte
- packages/publisher-utils: Shared TypeScript utilities

Features:
- Performance dashboard page with metrics, charts, and data tables
- shadcn-svelte UI components with OKLCH color system
- Biome for linting/formatting with Svelte-specific overrides

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

devenv.yaml

@@ -0,0 +1,4 @@
+# yaml-language-server: $schema=https://devenv.sh/devenv.schema.json
+inputs:
+  nixpkgs:
+    url: github:NixOS/nixpkgs/nixpkgs-unstable