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

background/message-router.js

@@ -32,6 +32,7 @@
       executeStepViaCompletionSignal,
       exportSettingsBundle,
       fetchGeneratedEmail,
+      finalizePhoneActivationAfterSuccessfulFlow,
       finalizeStep3Completion,
       finalizeIcloudAliasAfterSuccessfulFlow,
       findHotmailAccount,
@@ -209,6 +210,9 @@
         });
       }
       await finalizeIcloudAliasAfterSuccessfulFlow(latestState);
+      if (typeof finalizePhoneActivationAfterSuccessfulFlow === 'function') {
+        await finalizePhoneActivationAfterSuccessfulFlow(latestState);
+      }
     }
 
     async function handleStepData(step, payload) {