Migrate from Next.js to SvelteKit

- Replace Next.js app with SvelteKit + adapter-node
- basePath /bodenfeuchte configured in svelte.config.js
- MQTT listener starts via hooks.server.ts on server boot
- Chart.js replaces Recharts for the moisture graph
- Dockerfile simplified: single build step, node build output
- Removed custom server.ts (no longer needed)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

package.json

@@ -1,32 +1,29 @@
 {
-  "name": "bodenfeuchte",
-  "version": "0.1.0",
-  "private": true,
-  "scripts": {
-    "dev": "ts-node --project tsconfig.server.json server.ts",
-    "build": "next build",
-    "start": "node dist/server.js",
-    "build:server": "tsc --project tsconfig.server.json",
-    "lint": "eslint"
-  },
-  "dependencies": {
-    "better-sqlite3": "^12.10.0",
-    "mqtt": "^5.15.1",
-    "next": "16.2.6",
-    "react": "19.2.4",
-    "react-dom": "19.2.4",
-    "recharts": "^3.8.1"
-  },
-  "devDependencies": {
-    "@tailwindcss/postcss": "^4",
-    "@types/better-sqlite3": "^7.6.13",
-    "@types/node": "^20",
-    "@types/react": "^19",
-    "@types/react-dom": "^19",
-    "eslint": "^9",
-    "eslint-config-next": "16.2.6",
-    "tailwindcss": "^4",
-    "ts-node": "^10.9.2",
-    "typescript": "^5"
-  }
+	"name": "bodenfeuchte",
+	"private": true,
+	"version": "0.1.0",
+	"type": "module",
+	"scripts": {
+		"dev": "vite dev",
+		"build": "vite build",
+		"preview": "vite preview",
+		"prepare": "svelte-kit sync || echo ''",
+		"check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json",
+		"check:watch": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json --watch"
+	},
+	"dependencies": {
+		"better-sqlite3": "^12.10.0",
+		"chart.js": "^4.5.0",
+		"mqtt": "^5.15.1"
+	},
+	"devDependencies": {
+		"@sveltejs/adapter-node": "^5.2.11",
+		"@sveltejs/kit": "^2.57.0",
+		"@sveltejs/vite-plugin-svelte": "^7.0.0",
+		"@types/better-sqlite3": "^7.6.13",
+		"svelte": "^5.55.2",
+		"svelte-check": "^4.4.6",
+		"typescript": "^6.0.2",
+		"vite": "^8.0.7"
+	}
 }