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/logging/audit.go

@@ -0,0 +1,13 @@
+package logging
+
+import (
+	"database/sql"
+
+	"github.com/owen/vibeproxy/internal/database"
+)
+
+// Audit records a configuration-change event. Callers must never pass
+// passwords, API tokens, or private key material in details.
+func Audit(db *sql.DB, actor, action, target, details string) {
+	_ = database.InsertAuditLog(db, actor, action, target, details)
+}