feat(loop): support external CLI tools (cli-wrapper) in task management

- Fix missing i18n translations: loop.add, loop.save, loop.cancel
- Replace hardcoded validTools with dynamic tool loading from cli-tools.json
- Support external CLI wrappers (like doubao) in task creation and updates
- Add getEnabledToolsList() helper to fetch enabled tools dynamically
- Update mapIssueToolToLoopTool() to accept any string tool name
- Update validateTool() to use dynamic tool list
- Change LoopTask.tool type from specific strings to string (accepts any tool)

This allows tasks to use any enabled CLI tool from configuration,
including builtin tools, cli-wrappers, and api-endpoints, not just
the hardcoded ['bash', 'gemini', 'codex', 'qwen', 'claude'].

ccw/src/templates/dashboard-js/i18n.js

@@ -2202,6 +2202,9 @@ const i18n = {
     'loop.kanban.noBoardData': 'No tasks to display',
     'loop.listView': 'List View',
     'loop.addTask': 'Add Task',
+    'loop.add': 'Add',
+    'loop.save': 'Save',
+    'loop.cancel': 'Cancel',
 
     // Navigation & Grouping
     'loop.nav.groupBy': 'Group By',
@@ -4796,6 +4799,9 @@ const i18n = {
     'loop.kanban.noBoardData': '没有要显示的任务',
     'loop.listView': '列表视图',
     'loop.addTask': '添加任务',
+    'loop.add': '添加',
+    'loop.save': '保存',
+    'loop.cancel': '取消',
 
     // Navigation & Grouping
     'loop.nav.groupBy': '分组',