發佈 0.1.6：速度固定 Fast，移除選項與 footer 顯示

摘要：
速度（service tier）固定為 priority（Fast 1.5x）：表單移除速度下拉、
footer 不再顯示 Fast 字樣；舊設定檔存空值也會矯正回 priority。

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/registry.js

@@ -112,7 +112,7 @@ function validateBotInput({ name, token, workDir, sandbox }, { isCreate }) {
   }
 }
 
-async function createBot({ name, token, workDir, sandbox, model, reasoningEffort, serviceTier, timeoutMinutes }) {
+async function createBot({ name, token, workDir, sandbox, model, reasoningEffort, timeoutMinutes }) {
   validateBotInput({ name, token, workDir, sandbox }, { isCreate: true });
   const reg = loadRegistry();
   if (reg.bots[name]) throw new Error(`已有同名 bot：${name}`);
@@ -128,7 +128,7 @@ async function createBot({ name, token, workDir, sandbox, model, reasoningEffort
     sandbox: sandbox || 'workspace-write',
     model: model || '',
     reasoningEffort: reasoningEffort || '',
-    serviceTier: serviceTier || '',
+    serviceTier: 'priority', // 速度固定 Fast 1.5x
     timeoutMinutes: Number(timeoutMinutes) || 30,
     pm2Name: name,
     // UI 建的 bot 不各自開 web，統一由控制台管理
@@ -158,7 +158,6 @@ async function updateBot(name, patch) {
   }
   if (patch.model !== undefined) raw.model = patch.model;
   if (patch.reasoningEffort !== undefined) raw.reasoningEffort = patch.reasoningEffort;
-  if (patch.serviceTier !== undefined) raw.serviceTier = patch.serviceTier;
   if (patch.timeoutMinutes !== undefined && Number(patch.timeoutMinutes) > 0) {
     raw.timeoutMinutes = Number(patch.timeoutMinutes);
   }