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/header.html

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+{{define "header"}}<!doctype html>
+<html lang="en" data-bs-theme="light">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <title>{{.Title}} · vibeproxy</title>
+  <link rel="stylesheet" href="/static/css/bootstrap.min.css">
+  <link rel="stylesheet" href="/static/css/bootstrap-icons.min.css">
+  <link rel="stylesheet" href="/static/css/app.css">
+</head>
+<body>
+<div class="vp-shell">
+  <nav class="vp-sidebar d-flex flex-column">
+    <a href="/dashboard" class="vp-brand d-flex align-items-center gap-2">
+      <i class="bi bi-hexagon-fill"></i>
+      <span>vibeproxy</span>
+    </a>
+    <ul class="nav flex-column vp-nav">
+      <li class="nav-item"><a class="nav-link {{if eq .Active "dashboard"}}active{{end}}" href="/dashboard"><i class="bi bi-speedometer2"></i> Dashboard</a></li>
+      <li class="nav-item"><a class="nav-link {{if eq .Active "proxy_hosts"}}active{{end}}" href="/proxy-hosts"><i class="bi bi-globe2"></i> Proxy Hosts</a></li>
+      <li class="nav-item"><a class="nav-link {{if eq .Active "streams"}}active{{end}}" href="/streams"><i class="bi bi-arrow-left-right"></i> TCP/UDP Streams</a></li>
+      <li class="nav-item"><a class="nav-link {{if eq .Active "backends"}}active{{end}}" href="/backends"><i class="bi bi-hdd-network"></i> Backends</a></li>
+      <li class="nav-item"><a class="nav-link {{if eq .Active "certificates"}}active{{end}}" href="/certificates"><i class="bi bi-shield-lock"></i> Certificates</a></li>
+      <li class="nav-item"><a class="nav-link {{if eq .Active "access_lists"}}active{{end}}" href="/access-lists"><i class="bi bi-key"></i> Access Lists</a></li>
+      <li class="nav-item"><a class="nav-link {{if eq .Active "logs"}}active{{end}}" href="/logs"><i class="bi bi-journal-text"></i> Logs</a></li>
+      <li class="nav-item"><a class="nav-link {{if eq .Active "settings"}}active{{end}}" href="/settings"><i class="bi bi-gear"></i> Settings</a></li>
+      <li class="nav-item"><a class="nav-link {{if eq .Active "api"}}active{{end}}" href="/api-tokens"><i class="bi bi-code-slash"></i> API</a></li>
+    </ul>
+    <div class="vp-sidebar-footer text-secondary small">
+      <i class="bi bi-box-seam"></i> vibeproxy
+    </div>
+  </nav>
+  <div class="vp-main">
+    <header class="vp-topbar d-flex align-items-center justify-content-between">
+      <h1 class="h5 mb-0">{{.Title}}</h1>
+    </header>
+    <main class="vp-content">
+      {{if .Flash}}
+      <div class="alert alert-{{if .FlashKind}}{{.FlashKind}}{{else}}success{{end}} alert-dismissible fade show" role="alert">
+        {{.Flash}}
+        <button type="button" class="btn-close" data-bs-dismiss="alert"></button>
+      </div>
+      {{end}}
+{{end}}