Phase 0: project scaffold

- Go module + chi server with embedded SPA serving and /api/health
- internal/config env loader (local-dev defaults; auth/copyleaks deferred)
- React 19 + Vite 6 + Tailwind v4 frontend with full Petal design tokens
- Frontend embedded into the binary via web/embed.go (go:embed all:dist)
- README dev workflow, .env.example, BUILD_PLAN progress tracker
- Verified end-to-end: binary serves health, embedded SPA, and SPA fallback

web/package.json

@@ -0,0 +1,31 @@
+{
+  "name": "petal-web",
+  "private": true,
+  "version": "0.0.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "tsc && vite build",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "react": "^19.1.0",
+    "react-dom": "^19.1.0",
+    "@tiptap/react": "^2.11.5",
+    "@tiptap/pm": "^2.11.5",
+    "@tiptap/starter-kit": "^2.11.5",
+    "@tiptap/extension-underline": "^2.11.5",
+    "@tiptap/extension-text-align": "^2.11.5",
+    "@tiptap/extension-placeholder": "^2.11.5",
+    "@tiptap/extension-character-count": "^2.11.5"
+  },
+  "devDependencies": {
+    "@tailwindcss/vite": "^4.0.0",
+    "@types/react": "^19.1.0",
+    "@types/react-dom": "^19.1.0",
+    "@vitejs/plugin-react": "^4.3.4",
+    "tailwindcss": "^4.0.0",
+    "typescript": "^5.7.3",
+    "vite": "^6.1.0"
+  }
+}