feat(radius): RADIUS-Server via FreeRADIUS (PAP/CHAP) — v1.2.93

Files-basierter RADIUS-Server (Clients + Users), managed analog DHCP/WireGuard.
- Migration 0042: radius_settings (singleton, node-lokal), radius_clients (secret_enc), radius_users (password_enc) — Secrets via secrets.Box verschlüsselt.
- internal/freeradius: Multi-File-Renderer (clients.conf + authorize) via Box.Open, Secret-Escaping (" \), Service default-off/an enabled gekoppelt. internal/services/radius + internal/handlers/radius.go: Settings + Client/User-CRUD, write-only Secret-Semantik, Validierung (IP/CIDR, name-charset), GET liefert secret_configured statt Secret.
- Firewall: udp 1812/1813 Auto-Rule bei enabled. Cluster: clients/users repliziert (hashSpec), radius_settings node-lokal.
- main.go + render.go + WithAllReloaders. Packaging: freeradius Dependency, setgid-Dir /etc/edgeguard/freeradius (Gruppe freeradius), Symlinks clients.conf+authorize, disable-on-install, sudoers.
- UI: RADIUS-Seite (Einstellungen + Clients + Benutzer) unter Sicherheit, Route/Nav/i18n de/en.
- Tests (guarded): Renderer-Inhalt + Secret-Escaping/Roundtrip + Masking. Scope v1: PAP/CHAP files-based (kein EAP/802.1X).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

internal/firewall/firewall.go

@@ -434,6 +434,29 @@ func (g *Generator) loadAutoRules(ctx context.Context) []AutoFWRule {
 		}
 	}
 
+	// RADIUS (FreeRADIUS): wenn aktiviert → udp 1812 (auth) + 1813 (acct).
+	// Pro listen-IP, sonst global. FreeRADIUS verwirft unbekannte Clients selbst.
+	var radiusEnabled bool
+	var radiusListen string
+	if err := g.Pool.QueryRow(ctx, `SELECT enabled, listen_addresses FROM radius_settings WHERE id=1`).Scan(&radiusEnabled, &radiusListen); err == nil && radiusEnabled {
+		ips := splitCSV(radiusListen)
+		emit := func(ip string) {
+			out = append(out,
+				AutoFWRule{Proto: "udp", Port: 1812, DstIP: ip, Comment: "RADIUS-Auth (FreeRADIUS)"},
+				AutoFWRule{Proto: "udp", Port: 1813, DstIP: ip, Comment: "RADIUS-Acct (FreeRADIUS)"},
+			)
+		}
+		if len(ips) == 0 {
+			emit("")
+		} else {
+			for _, ip := range ips {
+				if !isLoopback(ip) && ip != "0.0.0.0" && ip != "::" {
+					emit(ip)
+				}
+			}
+		}
+	}
+
 	return out
 }