feat: rewrite to stateless web app with IndexedDB frontend

Replace CLI + SQLite architecture with a Go web server + vanilla JS
frontend using IndexedDB for all client-side data storage.

- Remove: cli, store, report, static packages
- Add: compute engine (BuildDashboard), server package, web UI
- Add: setup page with CRUD for profiles, rooms, devices, occupants, AC
- Add: dashboard with SVG temperature timeline, risk analysis, care checklist
- Add: i18n support (English/German) with server-side Go templates
- Add: LLM provider selection UI with client-side API key storage
- Add: per-room indoor temperature, edit buttons, language-aware AI summary

package.json

@@ -1,15 +1,11 @@
 {
-  "name": "heatwave-autopilot",
+  "name": "heatguard",
   "version": "1.0.0",
-  "description": "",
-  "main": "index.js",
+  "private": true,
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "css": "npx @tailwindcss/cli -i tailwind/input.css -o web/css/app.css --minify",
+    "css:watch": "npx @tailwindcss/cli -i tailwind/input.css -o web/css/app.css --watch"
   },
-  "keywords": [],
-  "author": "",
-  "license": "ISC",
-  "type": "commonjs",
   "devDependencies": {
     "@tailwindcss/cli": "^4.1.18",
     "tailwindcss": "^4.1.18"