feat: support manual HeroSMS maxPrice and defer phone reuse confirmation until final flow success

- 合并 PR #170 的核心改动：新增 HeroSMS 手动 maxPrice 配置，并调整手机号验证链路直接按手填价格取号
- 本地补充修复：吸收延后确认手机号复用计数、仅在整轮成功后提交 pending activation，以及保留 fresh reset 后的可复用号码状态
- 影响范围：background phone verification flow、platform-verify success cleanup、auto-run fresh reset、sidepanel phone verification settings

sidepanel/sidepanel.html

@@ -425,6 +425,11 @@
           <option value="52" selected>Thailand</option>
         </select>
       </div>
+      <div class="data-row" id="row-hero-sms-max-price" style="display:none;">
+        <span class="data-label">最高价格</span>
+        <input type="number" id="input-hero-sms-max-price" class="data-input mono" min="0.0001" step="0.0001" required
+          placeholder="必填，例如 0.08" />
+      </div>
       <div class="data-row" id="row-hero-sms-api-key" style="display:none;">
         <span class="data-label">接码 API</span>
         <div class="input-with-icon">