feat: static sites feature with Gitea/GitHub/GitLab support and Deno backend

Deploy static content from Git repository folders with optional server-side
API endpoints. Supports Gitea/Forgejo/Gogs, GitHub, and GitLab with provider
autodetection.

- New Sites entity with CRUD, encrypted secrets, and manual/push/tag sync triggers
- Pluggable GitProvider interface with three implementations
- Deno container mode: auto-generates router from API_{method}_{name} exports
- Static container mode: nginx serving files with optional markdown rendering
- Wizard UI with provider selector, repo picker, branch/folder tree pickers
- Deploy pipeline builds fresh image, starts container, configures NPM proxy
- Stop/Start buttons, force redeploy on manual trigger
- Periodic health checker detects crashed containers
- Proxy route existence check during auto-sync

internal/events/bus.go

@@ -21,6 +21,9 @@ const (
 
 	// EventLog is emitted for audit trail and operational log entries.
 	EventLog EventType = "event_log"
+
+	// EventStaticSiteStatus is emitted when a static site status changes.
+	EventStaticSiteStatus EventType = "static_site_status"
 )
 
 // Event is a single event published on the bus.
@@ -64,6 +67,13 @@ type EventLogPayload struct {
 	CreatedAt string `json:"created_at"`
 }
 
+// StaticSiteStatusPayload is the payload for EventStaticSiteStatus events.
+type StaticSiteStatusPayload struct {
+	SiteID string `json:"site_id"`
+	Name   string `json:"name"`
+	Status string `json:"status"`
+}
+
 // Subscriber is a channel that receives events.
 type Subscriber chan Event