feat: add incident management system with user reporting

- Status page (status.viktorbarzin.me): incident cards with SEV badges,
  expandable timelines, postmortem links, user report rendering
- Issue templates on infra repo for user outage reports
- CronJob reads incidents + user-reports from ViktorBarzin/infra
- "Report an Outage" button on status page links to infra repo
- Post-mortem agents restored (4-stage pipeline: triage → investigation
  → historian → report writer) with updated paths and issue linking
- Post-mortem skill/template updated to link reports to GitHub Issues
  and manage postmortem-required/postmortem-done labels
- Labels: incident, sev1-3, user-report, postmortem-required,
  postmortem-done on infra repo

[ci skip]

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,5 @@
+blank_issues_enabled: true
+contact_links:
+  - name: Service Status
+    url: https://status.viktorbarzin.me
+    about: Check current service status and active incidents

.github/ISSUE_TEMPLATE/outage-report.yml

@@ -0,0 +1,37 @@
+name: Report an Outage
+description: Report a service that appears to be down or degraded
+labels: ["user-report"]
+body:
+  - type: dropdown
+    id: service
+    attributes:
+      label: Affected Service
+      description: Which service is affected?
+      options:
+        - Nextcloud
+        - Immich
+        - Vaultwarden
+        - Grafana
+        - Plex / Jellyfin
+        - Mail
+        - DNS
+        - VPN / Tailscale
+        - Website / Blog
+        - Music (Navidrome / Freedify)
+        - Other
+    validations:
+      required: true
+  - type: textarea
+    id: description
+    attributes:
+      label: What's happening?
+      description: Describe what you're seeing. Include error messages, when it started, etc.
+      placeholder: "e.g., Getting 502 errors when trying to access Nextcloud since about 3pm"
+    validations:
+      required: true
+  - type: input
+    id: contact
+    attributes:
+      label: Contact (optional)
+      description: How can we reach you with updates?
+      placeholder: Email, Telegram handle, etc.