🔥 移除旧密码重置审核系统 & ✨ 优化存储管理UI

后端改进：
- 移除需要管理员审核的密码重置请求功能
- 简化密码重置流程，直接使用邮件重置
- 删除 password_reset_requests 表及相关代码

前端优化：
- 重新设计存储管理界面，采用现代化渐变风格
- 改进存储方式切换交互，添加动画效果
- 优化视觉层次和信息展示

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

frontend/app.html

@@ -1111,45 +1111,120 @@
             <i class="fas fa-database"></i> 存储管理
           </h3>
 
-          <div style="background: #f8f9fa; padding: 20px; border-radius: 8px;">
-            <div style="margin-bottom: 15px;">
-              <span style="font-weight: 600; color: #333;">当前存储方式: </span>
-              <span style="color: #667eea; font-weight: 600;">{{ storageTypeText }}</span>
+          <div style="background: linear-gradient(135deg, #f3f5ff 0%, #eef7ff 100%); padding: 22px; border-radius: 14px; box-shadow: 0 10px 30px rgba(102,126,234,0.12); border: 1px solid #e3e9ff;">
+            <div style="display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap;">
+              <div style="display: flex; align-items: center; gap: 10px;">
+                <span style="font-weight: 700; color: #334155;">当前模式</span>
+                <span :style="{
+                  padding: '6px 12px',
+                  borderRadius: '999px',
+                  background: storageType === 'local' ? 'rgba(40,167,69,0.12)' : 'rgba(102,126,234,0.12)',
+                  color: storageType === 'local' ? '#1c7c3d' : '#4b5fc9',
+                  fontWeight: 700,
+                  display: 'inline-flex',
+                  alignItems: 'center',
+                  gap: '6px'
+                }">
+                  <i :class="storageType === 'local' ? 'fas fa-hard-drive' : 'fas fa-server'"></i>
+                  {{ storageTypeText }}
+                </span>
+              </div>
+              <div v-if="storageSwitching" style="color: #4b5fc9; font-weight: 600; display: inline-flex; align-items: center; gap: 8px;">
+                <i class="fas fa-sync-alt fa-spin"></i>
+                正在切换到 {{ storageSwitchTarget === 'sftp' ? 'SFTP 存储' : '本地存储' }}...
+              </div>
+              <div v-else style="color: #666; font-size: 13px;">本地存储适合快速读写，SFTP 适合独立服务器空间</div>
             </div>
 
-            <div v-if="storageType === 'local'" style="margin-bottom: 15px;">
-              <span style="font-weight: 600; color: #333;">配额使用: </span>
-              <span>{{ localUsedFormatted }} / {{ localQuotaFormatted }} ({{ quotaPercentage }}%)</span>
-              <div style="margin-top: 8px; width: 100%; height: 18px; background: #e0e0e0; border-radius: 9px; overflow: hidden;">
-                <div :style="{
-                  width: quotaPercentage + '%',
-                  height: '100%',
-                  background: quotaPercentage > 90 ? '#dc3545' : quotaPercentage > 75 ? '#ffc107' : '#28a745',
-                  transition: 'width 0.3s'
-                }"></div>
+            <div style="margin-top: 16px; background: white; border-radius: 12px; padding: 12px; border: 1px solid #e2e8f0;">
+              <div style="display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; align-items: center;">
+                <button
+                  class="btn"
+                  :class="storageType === 'local' ? 'btn-primary' : 'btn-secondary'"
+                  style="width: 100%; border-radius: 10px; padding: 12px; display: inline-flex; align-items: center; justify-content: center; gap: 8px; transition: all .3s;"
+                  :disabled="storageType === 'local' || storageSwitching"
+                  @click="switchStorage('local')">
+                  <i class="fas fa-hard-drive"></i>
+                  切换到本地
+                </button>
+                <div style="height: 4px; background: #e2e8f0; border-radius: 999px; position: relative; overflow: hidden;">
+                  <div :style="{
+                    position: 'absolute',
+                    left: storageType === 'local' ? '6%' : '52%',
+                    width: '42%',
+                    height: '100%',
+                    background: 'linear-gradient(90deg,#667eea,#764ba2)',
+                    borderRadius: '999px',
+                    transition: 'left .35s ease'
+                  }"></div>
+                </div>
+                <button
+                  class="btn"
+                  :class="storageType === 'sftp' ? 'btn-primary' : 'btn-secondary'"
+                  style="width: 100%; border-radius: 10px; padding: 12px; display: inline-flex; align-items: center; justify-content: center; gap: 8px; transition: all .3s;"
+                  :disabled="storageType === 'sftp' || storageSwitching"
+                  @click="switchStorage('sftp')">
+                  <i class="fas fa-server"></i>
+                  切换到 SFTP
+                </button>
               </div>
             </div>
 
-            <div style="display: flex; gap: 15px; flex-wrap: wrap;">
-              <button
-                class="btn"
-                :class="storageType === 'local' ? 'btn-primary' : 'btn-secondary'"
-                @click="switchStorage('local')"
-                :disabled="storageType === 'local'">
-                <i class="fas fa-hard-drive"></i> 本地存储
-              </button>
-              <button
-                class="btn"
-                :class="storageType === 'sftp' ? 'btn-primary' : 'btn-secondary'"
-                @click="switchStorage('sftp')"
-                :disabled="storageType === 'sftp'">
-                <i class="fas fa-server"></i> SFTP存储
-              </button>
+            <div style="display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 14px; margin-top: 14px;">
+              <div style="background: white; border: 1px solid #e2e8f0; border-radius: 12px; padding: 16px; box-shadow: 0 6px 20px rgba(0,0,0,0.04);">
+                <div style="display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px;">
+                  <div style="font-weight: 700; color: #0f172a; display: flex; gap: 8px; align-items: center;">
+                    <i class="fas fa-hard-drive"></i> 本地存储
+                  </div>
+                  <span v-if="storageType === 'local'" style="font-size: 12px; color: #28a745; background: rgba(40,167,69,0.12); padding: 4px 8px; border-radius: 999px;">当前</span>
+                </div>
+                <div style="color: #475569; font-size: 13px; margin-bottom: 10px;">更快的读写，适合日常上传下载。</div>
+                <div style="margin-bottom: 10px;">
+                  <div style="font-size: 12px; color: #64748b; margin-bottom: 6px;">配额使用</div>
+                  <div style="font-weight: 600; color: #0f172a;">{{ localUsedFormatted }} / {{ localQuotaFormatted }}</div>
+                  <div style="margin-top: 6px; width: 100%; height: 10px; background: #e2e8f0; border-radius: 5px; overflow: hidden;">
+                    <div :style="{
+                      width: quotaPercentage + '%',
+                      height: '100%',
+                      background: quotaPercentage > 90 ? '#dc3545' : quotaPercentage > 75 ? '#ffc107' : '#28a745',
+                      transition: 'width 0.35s ease'
+                    }"></div>
+                  </div>
+                </div>
+                <button class="btn btn-primary" style="width: 100%; border-radius: 10px;" :disabled="storageType === 'local' || storageSwitching" @click="switchStorage('local')">
+                  <i class="fas fa-bolt"></i> 用本地存储
+                </button>
+              </div>
+
+              <div style="background: white; border: 1px solid #e2e8f0; border-radius: 12px; padding: 16px; box-shadow: 0 6px 20px rgba(0,0,0,0.04);">
+                <div style="display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px;">
+                  <div style="font-weight: 700; color: #0f172a; display: flex; gap: 8px; align-items: center;">
+                    <i class="fas fa-server"></i> SFTP 存储
+                  </div>
+                  <span v-if="storageType === 'sftp'" style="font-size: 12px; color: #4b5fc9; background: rgba(102,126,234,0.15); padding: 4px 8px; border-radius: 999px;">当前</span>
+                </div>
+                <div style="color: #475569; font-size: 13px; margin-bottom: 10px;">使用你自己的服务器空间，独立存储更灵活。</div>
+                <div v-if="user?.has_ftp_config" style="font-size: 13px; color: #0f172a; margin-bottom: 10px;">
+                  已配置: {{ user.ftp_host }}:{{ user.ftp_port }}
+                </div>
+                <div v-else style="font-size: 13px; color: #b45309; background: #fff7ed; border: 1px dashed #fcd34d; padding: 10px; border-radius: 8px; margin-bottom: 10px;">
+                  <i class="fas fa-exclamation-circle"></i> 先填写 SFTP 连接信息再切换
+                </div>
+                <button
+                  class="btn"
+                  :class="user?.has_ftp_config ? 'btn-primary' : 'btn-secondary'"
+                  style="width: 100%; border-radius: 10px;"
+                  :disabled="storageType === 'sftp' || storageSwitching"
+                  @click="switchStorage('sftp')">
+                  <i class="fas fa-random"></i>
+                  {{ user?.has_ftp_config ? '切到 SFTP 存储' : '去配置 SFTP' }}
+                </button>
+              </div>
             </div>
 
-            <div style="margin-top: 15px; padding: 10px; background: #fff3cd; border-radius: 6px; font-size: 13px; color: #856404;">
-              <i class="fas fa-info-circle"></i>
-              <strong>提示:</strong> 本地存储速度快但有配额限制；SFTP存储需先配置服务器信息
+            <div style="margin-top: 12px; padding: 10px 12px; background: #f1f5f9; border-radius: 10px; font-size: 13px; color: #475569;">
+              <i class="fas fa-info-circle" style="color: #4b5fc9;"></i>
+              本地存储速度快但受配额限制；SFTP 需先配置连接，切换过程中可继续查看文件列表。
             </div>
           </div>
         </div>
@@ -1641,39 +1716,6 @@
         </div>
       </div>
 
-      <!-- 密码重置审核区域 -->
-      <div class="card" style="margin-top: 30px;">
-        <h3 style="margin-bottom: 20px;">密码重置审核</h3>
-        <div v-if="passwordResetRequests.length === 0" class="alert alert-info">
-          暂无待审核的密码重置请求
-        </div>
-        <table v-else style="width: 100%; border-collapse: collapse; table-layout: fixed;">
-          <thead>
-            <tr style="border-bottom: 2px solid #ddd;">
-              <th style="padding: 10px; text-align: left;">用户名</th>
-              <th style="padding: 10px; text-align: left;">邮箱</th>
-              <th style="padding: 10px; text-align: left;">提交时间</th>
-              <th style="padding: 10px; text-align: center;">操作</th>
-            </tr>
-          </thead>
-          <tbody>
-            <tr v-for="req in passwordResetRequests" :key="req.id" style="border-bottom: 1px solid #eee;">
-              <td style="padding: 10px;">{{ req.username }}</td>
-              <td style="padding: 10px;">{{ req.email }}</td>
-              <td style="padding: 10px;">{{ formatDate(req.created_at) }}</td>
-              <td style="padding: 10px; text-align: center;">
-                <button class="btn" style="background: #28a745; color: white; margin: 2px;" @click="reviewPasswordReset(req.id, true)">
-                  <i class="fas fa-check"></i> 批准
-                </button>
-                <button class="btn" style="background: #dc3545; color: white; margin: 2px;" @click="reviewPasswordReset(req.id, false)">
-                  <i class="fas fa-times"></i> 拒绝
-                </button>
-              </td>
-            </tr>
-          </tbody>
-        </table>
-      </div>
-
       <!-- 上传工具管理区域 -->
       <div class="card" style="margin-top: 30px;">
         <h3 style="margin-bottom: 20px;">