Add public monitoring features and CI updates

- Add status pages, incidents, badges, maintenance, bulk ops, and metrics
- Add Docker packaging, env example, and frontend routes
- Refresh GitHub workflows and project metadata

.env.example

@@ -0,0 +1,23 @@
+# Beszel Hub Settings
+APP_URL=http://localhost:8090
+INSTANCE_NAME=Beszel Monitoring
+
+# Auth & Features
+REGISTRATION_ENABLED=true
+TWO_FACTOR_ENABLED=true
+PASSKEY_ENABLED=true
+
+# Limits
+MAX_MONITORS_PER_USER=50
+MAX_DOMAINS_PER_USER=50
+MAX_STATUS_PAGES=10
+
+# Optional Features
+PAGESPEED_ENABLED=true
+SUBDOMAIN_DISCOVERY=true
+STATUS_PAGES_ENABLED=true
+BADGES_ENABLED=true
+
+# Beszel Agent (only needed if running agent via docker compose --profile agent)
+# AGENT_KEY=your_public_key_here
+# AGENT_PORT=45876