feat(monitoring): resolve Loki-stack syslog ingestion with rsyslog filter fix

Fixed critical issue preventing UniFi router logs from reaching Loki/Promtail/Grafana.

Root Cause:
- rsyslog filter in /etc/rsyslog.d/unifi-router.conf filtered for 192.168.1.1
- VM 101 on VLAN 2, actual source IP is 192.168.2.1 (VLAN 2 gateway)
- Filter silently rejected all incoming syslog traffic

Solution:
- Updated rsyslog filter from 192.168.1.1 to 192.168.2.1
- Logs now flow: UniFi → rsyslog → Promtail → Loki → Grafana

Changes:
- Add services/loki-stack/* - Complete Loki/Promtail/Grafana stack configs
- Add services/logward/* - Logward service configuration
- Update troubleshooting/loki-stack-bugfix.md - Complete 5-phase resolution
- Update CLAUDE_STATUS.md - Document 2025-12-11 resolution
- Update sub-agents/scribe.md - Agent improvements
- Remove services/promtail-config.yml - Duplicate file cleanup

Status: ✅ Monitoring stack fully operational, syslog ingestion active

Technical Details: See troubleshooting/loki-stack-bugfix.md for complete analysis

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

services/loki-stack/promtail-config.yaml

@@ -0,0 +1,22 @@
+server:
+  http_listen_port: 9080
+  grpc_listen_port: 0
+
+positions:
+  filename: /tmp/positions.yaml
+
+clients:
+  - url: http://loki:3100/loki/api/v1/push
+
+scrape_configs:
+  - job_name: syslog_ingest
+    syslog:
+      listen_address: 0.0.0.0:1514
+      listen_protocol: tcp     # We only listen on TCP now
+      idle_timeout: 60s
+      label_structured_data: yes
+      labels:
+        job: "syslog_combined" # One job for both Proxmox and UniFi
+    relabel_configs:
+      - source_labels: ['__syslog_message_hostname']
+        target_label: 'host'