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/templates/partials/footer.html

@@ -0,0 +1,9 @@
+{{define "footer"}}
+    </main>
+  </div>
+</div>
+<script src="/static/js/bootstrap.bundle.min.js"></script>
+<script src="/static/js/app.js"></script>
+</body>
+</html>
+{{end}}