fix(security): never sign tokens with a known JWT secret (FLAW-04)
Without JWT_SECRET, or with one of the published placeholders, the server generates 32 random bytes once and keeps them in the data directory (jwt.secret, mode 0600), so tokens cannot be forged and logins survive restarts. Instances that ran on the old default log in once more. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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@@ -58,7 +58,7 @@ Das Frontend liegt per `go:embed` im Binary ([cmd/server/main.go](../cmd/server/
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| `PORT` | `8080` | HTTP-Port |
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| `DATA_DIR` | `./data` (Container: `/data`) | Verzeichnis der Datenbank |
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| `DATABASE_URL` | leer | `sqlite:///pfad/datei.db` oder Pfad; ohne Angabe `DATA_DIR/mindsift.db`. Postgres-URLs werden **nicht** unterstützt (siehe Hinweis) |
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| `JWT_SECRET` | festes Fallback (unsicher!) | Signaturschlüssel der Tokens; unbedingt setzen, siehe [FLAW-04](flaws.md) |
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| `JWT_SECRET` | zufällig erzeugt, gespeichert in `$DATA_DIR/jwt.secret` | Signaturschlüssel der Tokens; bekannte Platzhalter werden ignoriert ([FLAW-04](flaws.md)) |
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| `BASE_URL` | `http://localhost:<PORT>` | Basis-URL der Instanz |
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| `ALLOW_REGISTRATION` | `false` | Startwert; die Einstellung im Admin-UI (`system_settings`) hat Vorrang |
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| `LOG_LEVEL` / `DEBUG` | `info` / `false` | `debug`, `info`, `warn`, `error`; `DEBUG=true` erzwingt `debug` |
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