feat(oam): deploy Smokeping, NetDisco, Oxidized, UNPoller on tsys-librenms [#337][#375]

Deploy OAM monitoring stack on tsys-librenms VM:

- Smokeping: fully operational (port 8081, 16 targets, FPing probing)
- NetDisco: backend+DB+PostgreSQL running (port 8082), all 4 Dell switches
  discovered via SNMP. Web UI blocked by Dancer session_cookie_key config
  issue — needs interactive netdisco-deploy run
- Oxidized: container running (port 8083), deployed with placeholder
  credentials — needs switch login/password to start config backups
- UNPoller: config + docker-compose ready, blocked on Docker image
  availability (image moved from all common registries)
- Weathermap: not yet started (deferred to separate commit)

All configs use DNS names only (no IP literals). All scripts pass
shellcheck via check-rules.sh.

💘 Generated with Crush

Assisted-by: Crush:glm-5.2

oam/smokeping/General

@@ -0,0 +1,84 @@
+*** General ***
+
+owner = Charles N Wyble
+contact = reachableceo@knownelement.com
+mailhost = localhost
+cgiurl = http://tsys-librenms.knel.net:8081/smokeping/smokeping.cgi
+syslogfacility = local0
+# each probe run every 5 minutes, 300 samples = 25 hours at 5min steps
+pagedir = /data/pages
+piddir  = /tmp
+imgcache = /data/cache
+imgurl  = /smokeping/images
+datadir = /data/_data
+dyndir = /data/dyn
+
+*** Database ***
+
+step     = 300
+pings    = 20
+
+# consfn mrhb steps total
+
+AVERAGE  0.5   1  100800
+AVERAGE  0.5  12  43200
+    MIN  0.5  12  43200
+    MAX  0.5  12  43200
+AVERAGE  0.5 144   7200
+    MAX  0.5 144   7200
+    MIN  0.5 144   7200
+
+*** Presentation ***
+
+template = /etc/smokeping/basepage.html
+
++ charts
+
++ detail
+width = 600
+height = 200
+nradius = 5
+
+*** Probes ***
+
++ FPing
+
+binary = /usr/local/bin/fping
+hostinterval = 1.5
+mininterval = 0.001
+offset = 0%
+
+*** Alerts ***
+
+to = reachableceo@knownelement.com
+from = smokeping-alert@tsys-librenms.knel.net
+
++bigloss
+type = loss
+# in percent
+pattern = ==0%,==0%,==0%,==0%,>0%,>0%,>0%
+comment = suddenly there is packet loss
+
++somedoss
+type = loss
+# in percent
+pattern = ==0%,==0%,==0%,==0%,==0%,>0%,>0%,>0%,>0%,>0%,>0%,>0%
+comment = incoming packet loss
+
++startloss
+type = loss
+# in percent
+pattern = >0%,>0%,>0%
+comment = loss at startup
+
++rttdetect
+type = rtt
+# in milliseconds
+pattern = <10,<10,<10,<10,<10,<10,<10,>10,>10,>10
+comment = routing change?
+
++rttbadd
+type = rtt
+# in milliseconds
+pattern = <50,<50,<50,<50,<50,<50,>50,>50,>50,>50
+comment = reroute?