Initial vibeproxy implementation

Self-contained HTTP/HTTPS/TCP/UDP reverse proxy manager written in Go,
with SQLite storage, a Bootstrap 5 admin UI (Go templates, no JS
framework), and a REST API under /api/v1.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QTXFrNP1imCW7jtfL5SZrw

internal/web/backends.go

@@ -0,0 +1,34 @@
+package web
+
+import "net/http"
+
+type backendRow struct {
+	ProxyHostID   int64
+	ProxyHostName string
+	Host          string
+	Port          int
+	Weight        int
+	Enabled       bool
+	Healthy       bool
+	HealthCheck   string
+}
+
+func (h *Web) handleBackendsList(w http.ResponseWriter, r *http.Request) {
+	snap := h.store.Current()
+	seen := map[int64]bool{}
+	var rows []backendRow
+	for _, rt := range snap.HostsByDomain {
+		if seen[rt.Model.ID] || rt.Pool == nil {
+			continue
+		}
+		seen[rt.Model.ID] = true
+		for _, b := range rt.Pool.Backends {
+			rows = append(rows, backendRow{
+				ProxyHostID: rt.Model.ID, ProxyHostName: rt.Model.Name,
+				Host: b.Model.Host, Port: b.Model.Port, Weight: b.Model.Weight,
+				Enabled: b.Model.Enabled, Healthy: b.Healthy(), HealthCheck: string(b.Model.HealthCheckType),
+			})
+		}
+	}
+	render(w, "backends", PageData{Active: "backends", Title: "Backends", Data: rows})
+}