rebrand: Klassenportal, domain info1.ifb.lol, server status

- Replace INFO1 brand with Klassenportal everywhere (titles, nav,
  emails, TOTP issuer, recovery codes)
- Update domain from info1.simon0x.xyz to info1.ifb.lol
- Remove E2EE claims (e2ee.js was deleted, claims were false)
- Add GET /api/health endpoint (DB check + uptime)
- Add live server status section to landing page
- Fix README: domain, title, layout table

package.json

@@ -5,14 +5,14 @@
   "scripts": {
     "start": "node index.js"
   },
-  "keywords": ["dashboard", "education", "class", "self-hosted", "e2ee", "express", "sqlite"],
+  "keywords": ["dashboard", "education", "class", "self-hosted", "express", "sqlite"],
   "author": "lulinretrograde",
   "license": "MIT",
   "repository": {
     "type": "git",
     "url": "git+https://github.com/lulinretrograde/ifb-schulapp.git"
   },
-  "description": "Self-hosted class dashboard: timetable, homework, grades, shared calendar, class chat, and end-to-end encrypted direct messages. Built on Node.js, Express, SQLite, vanilla JS.",
+  "description": "Self-hosted class dashboard: timetable, homework, grades, shared calendar, and class chat. Built on Node.js, Express, SQLite, vanilla JS.",
   "dependencies": {
     "bcryptjs": "^3.0.3",
     "better-sqlite3": "^12.9.0",