feat: add http, snmp, docker plugins; new widgets and routes for traefik/unifi/ups

- Add HTTP monitor plugin: endpoint checking with status history, latency tracking, time-range views
- Add SNMP plugin: OID polling, device management, metric recording
- Add Docker plugin: container status, resource usage, widget
- Traefik: access log widget, request chart widget, expanded routes
- UniFi: clients widget, devices widget, expanded poll routes
- UPS: history widget, additional routes
- Update plugin index with new entries

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

http/plugin.yaml

@@ -0,0 +1,19 @@
+name: http
+version: "1.0.0"
+description: "Synthetic HTTP endpoint monitoring — status code, response time, content match, TLS expiry"
+author: "FabledScryer"
+license: "MIT"
+min_app_version: "0.1.0"
+repository_url: "https://git.fabledsword.com/bvandeusen/FabledScryer-plugins"
+homepage: "https://git.fabledsword.com/bvandeusen/FabledScryer-plugins/src/branch/main/http"
+tags:
+  - monitoring
+  - http
+  - synthetic
+  - uptime
+
+config:
+  check_interval_seconds: 60
+  default_timeout_seconds: 10
+  follow_redirects: true
+  verify_ssl: true