Initial commit: server-monitor v1 (Python)

Kompletter Neustart als Python-Projekt.
Portiert von zfs-monitor Bash v3, saubere Architektur:
- config.py: TOML-Config mit dataclasses
- state.py: zentrales State-Management (JSON statt Einzeldateien)
- notify.py: Telegram + Persistent Alerting als wiederverwendbare Klasse
- checks/zfs.py: ZFS Pool-Health, I/O-Fehler, Kapazität
- checks/smart.py: SATA + NVMe SMART-Monitoring
- checks/nut.py: NUT/USV-Monitoring (APC Back-UPS RS 1500G)

server-monitor.toml

@@ -0,0 +1,56 @@
+# ============================================================
+#  server-monitor Konfiguration
+# ============================================================
+
+[telegram]
+token   = "DEIN_TOKEN"
+chat_id = "DEINE_CHAT_ID"
+
+[monitoring]
+# hostname = ""        # Standard: automatisch via hostname
+log_file   = "/var/log/server-monitor/monitor.log"
+state_file = "/var/lib/server-monitor/state.json"
+
+# ------------------------------------------------------------
+#  Persistent Alerting
+#  Monitor läuft alle 5 min via systemd timer.
+#  critical_repeat_runs = 1  → jedes Mal (alle 5 min)
+#  warning_repeat_runs  = 6  → alle 30 min
+#  0 = kein Repeat (einmalig)
+# ------------------------------------------------------------
+[alert]
+critical_repeat_runs = 1
+warning_repeat_runs  = 6
+
+# ------------------------------------------------------------
+#  ZFS
+# ------------------------------------------------------------
+[zfs]
+pools    = ["blackhole", "vault"]
+warn_pct = 85
+crit_pct = 95
+timeout  = 10
+
+# ------------------------------------------------------------
+#  SMART
+# ------------------------------------------------------------
+[smart]
+extra_disks      = ["/dev/sdp"]   # Disks außerhalb von Pools
+reallocated_max  = 0
+pending_max      = 0
+uncorrectable_max = 0
+temp_max         = 55             # °C
+timeout          = 15
+
+# ------------------------------------------------------------
+#  NUT / USV
+# ------------------------------------------------------------
+[nut]
+enabled          = false
+# Name(n) aus /etc/nut/ups.conf (upsc <name>@<host>)
+ups              = ["ups@localhost"]
+batt_warn_pct    = 50             # % Akkuladestand Warnung
+batt_crit_pct    = 20             # % Akkuladestand Critical
+load_warn_pct    = 80             # % Last Warnung
+runtime_crit_sec = 300            # Sekunden Restlaufzeit bis Critical (5 min)
+timeout          = 10