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.nix

@@ -0,0 +1,20 @@
+{ pkgs, ... }:
+
+{
+  packages = with pkgs; [
+    nixfmt-rfc-style
+    biome
+    git
+  ];
+
+  dotenv.enable = true;
+
+  languages.javascript = {
+    enable = true;
+    bun.enable = true;
+  };
+
+  processes = {
+    dashboard.exec = "bun run --filter @publisher/dashboard dev";
+  };
+}