Add navbar and home page with search functionality

- Create new home page (/) with overview stats, ASN lookup,
  AS name search, and IP address lookup with JSON display
- Add responsive navbar to all pages with app branding
- Navbar shows "routewatch by @sneak" with link to author
- Status page accessible via navbar link
- Remove redirect from / to /status, serve home page instead

internal/server/handlers.go

@@ -87,10 +87,16 @@ func (s *Server) handleHealthCheck() http.HandlerFunc {
 	}
 }
 
-// handleRoot returns a handler that redirects to /status.
-func (s *Server) handleRoot() http.HandlerFunc {
-	return func(w http.ResponseWriter, r *http.Request) {
-		http.Redirect(w, r, "/status", http.StatusSeeOther)
+// handleIndex returns a handler that serves the home page.
+func (s *Server) handleIndex() http.HandlerFunc {
+	return func(w http.ResponseWriter, _ *http.Request) {
+		w.Header().Set("Content-Type", "text/html; charset=utf-8")
+
+		tmpl := templates.IndexTemplate()
+		if err := tmpl.Execute(w, nil); err != nil {
+			s.logger.Error("Failed to render index template", "error", err)
+			http.Error(w, "Internal Server Error", http.StatusInternalServerError)
+		}
 	}
 }
 

internal/server/routes.go

@@ -21,7 +21,7 @@ func (s *Server) setupRoutes() {
 	r.Use(JSONResponseMiddleware)
 
 	// Routes
-	r.Get("/", s.handleRoot())
+	r.Get("/", s.handleIndex())
 	r.Get("/status", s.handleStatusHTML())
 	r.Get("/status.json", JSONValidationMiddleware(s.handleStatusJSON()).ServeHTTP)
 	r.Get("/.well-known/healthcheck.json", JSONValidationMiddleware(s.handleHealthCheck()).ServeHTTP)