Fundament: Doku, Testanpassungen, Restbereinigung

- AGENTS.md und README.md auf Craftvia umgeschrieben (Regeln, Andockpunkte,
  Stack mit Garage, tsx-Tests, Gate, Demo-Logins)
- ISMS-Dokumente entfernt (SPEC, Prototypen, Lane-Prompts, Übergaben, Konzepte
  Incidents/Framework); Fundament-Doku (Deploy, Sicherheit, Backup, Identity) bleibt
- Fundament-Tests an Craftvia-Rollen/Branding angepasst, Resttreffer
  certvia/isms in Skripten und Kommentaren bereinigt

Gate: prisma generate, migrate status, tsc, lint, build, 22/22 Testskripte grün.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/server/actions/backup-settings.ts

@@ -124,7 +124,7 @@ export async function testBackupConnection(
     }
 
     const key = `__connectivity-test__/${randomBytes(8).toString("hex")}.txt`;
-    const payload = Buffer.from(`certvia backup connectivity ${new Date().toISOString()}`, "utf8");
+    const payload = Buffer.from(`craftvia backup connectivity ${new Date().toISOString()}`, "utf8");
     try {
       await store.put(key, payload);
       const back = await store.get(key);