feat: Sprint 0 — GoFiber + HTMX + TailwindCSS v4 scaffolding

- Go module: git.tukangketik.id/swanadiva/hostkeeper/v2
- GoFiber v2 server with static, template engine, middleware
- HTMX + Alpine.js (downloaded from CDN)
- TailwindCSS v4 with custom theme (Lumina System colors)
- Custom CSS: dot-grid, glassmorphism, animations, toggle, modal
- Layout template (sidebar nav + header + main)
- Dashboard page with host list, search, filter, view toggle
- Health endpoint: GET /api/health

app/backend/package.json

@@ -0,0 +1,16 @@
+{
+  "name": "backend",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "type": "commonjs",
+  "devDependencies": {
+    "@tailwindcss/cli": "^4.3.2"
+  }
+}