feat: 完整分销系统 — 后端 + 主站管理 + 分站前端模板

分销商后端:
- 分销商注册/审核/CRUD API
- 分站用户注册/登录/登出 (session cookie auth)
- 分站 Token CRUD、充值兑换、套餐订阅
- 分站域名/子域名自动识别中间件 (DistIdentify)
- 分销商收益异步记账 + markup 加价计费
- 模型价格快照、渠道路由配置
- 管理员审核/管理分销商

主站前端 (web/):
- 分销商注册申请、设置、客户管理(分页)、套餐管理(含速率限制)
- 收益管理(含汇总卡片+分页列表)、模型管理
- 管理员分销商审核面板
- DistributorLayout 标签页布局 + 路由

分站前端模板 (dist-site/):
- React + Vite + Tailwind 暗色主题 glassmorphism 设计
- react-bits 动画组件 (GradientText, BlurText, CountUp, SpotlightCard 等)
- Session cookie 认证 + New-Api-User header
- 首页/登录/注册/Dashboard/API Keys/定价/套餐 7 个页面
- Token 创建后一次性密钥展示、余额检查订阅确认

Bug 修复:
- 修复 DistUserRegister 密码双重哈希导致用户无法登录
- 修复 401 响应不清除 React user 状态
- 修复订阅确认弹窗不显示余额且提前关闭
- 修复 Home 页 Subscribe 按钮跳转错误 (/dashboard → /packages)
- 修复 Login/Register 组件卸载后 setState 警告
- 修复 DistributorEarnings 引用不存在的 username 字段
- 修复 DistributorCustomers 引用不存在的 created_at 字段

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/index.css

@@ -0,0 +1,74 @@
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+@layer base {
+  :root {
+    --brand: 99 102 241;
+  }
+
+  body {
+    @apply bg-black text-white;
+    font-feature-settings: 'cv02', 'cv03', 'cv04', 'cv11';
+  }
+
+  ::selection {
+    @apply bg-brand-500/30;
+  }
+
+  /* Scrollbar */
+  ::-webkit-scrollbar {
+    @apply w-1.5;
+  }
+  ::-webkit-scrollbar-track {
+    @apply bg-transparent;
+  }
+  ::-webkit-scrollbar-thumb {
+    @apply bg-neutral-700 rounded-full;
+  }
+}
+
+@layer components {
+  .glass {
+    @apply bg-white/[0.03] backdrop-blur-xl border border-white/[0.06] rounded-2xl;
+  }
+
+  .glass-sm {
+    @apply bg-white/[0.04] backdrop-blur-md border border-white/[0.08] rounded-xl;
+  }
+
+  .btn-primary {
+    @apply px-6 py-2.5 rounded-xl bg-brand-600 text-white font-medium text-sm
+           hover:bg-brand-500 active:bg-brand-700
+           transition-all duration-200 ease-out
+           shadow-lg shadow-brand-600/20
+           disabled:opacity-50 disabled:cursor-not-allowed;
+  }
+
+  .btn-secondary {
+    @apply px-6 py-2.5 rounded-xl border border-white/10 text-white font-medium text-sm
+           hover:bg-white/5 active:bg-white/10
+           transition-all duration-200 ease-out
+           disabled:opacity-50 disabled:cursor-not-allowed;
+  }
+
+  .input {
+    @apply w-full px-4 py-2.5 rounded-xl border border-white/10 bg-white/[0.04]
+           text-white placeholder-neutral-500 text-sm
+           focus:outline-none focus:ring-2 focus:ring-brand-500/40 focus:border-brand-500/60
+           transition-all duration-200;
+  }
+
+  .card-glow {
+    @apply relative overflow-hidden;
+  }
+
+  .card-glow::before {
+    content: '';
+    @apply absolute -inset-0.5 bg-gradient-to-r from-brand-500/20 via-purple-500/20 to-pink-500/20 rounded-2xl opacity-0 transition-opacity duration-500;
+  }
+
+  .card-glow:hover::before {
+    @apply opacity-100;
+  }
+}