feat: 人工补充资料的系统字段改为选填

系统（安卓/苹果）与区服均改为选填，仅游戏编号、游戏昵称必填；
同步更新默认字段模板单元测试

apps/backend/src/services/worker-platform/mappers.ts

@@ -533,7 +533,7 @@ export function normalizeRequirementFields(value: unknown) {
   return [
     { key: 'gameId', label: '游戏编号', required: true, type: 'text', options: [], mockValue: 'test_uid' },
     { key: 'gameNickname', label: '游戏昵称', required: true, type: 'text', options: [], mockValue: '测试角色' },
-    { key: 'system', label: '系统', required: true, type: 'select', options: ['安卓', '苹果'], mockValue: '安卓' },
+    { key: 'system', label: '系统', required: false, type: 'select', options: ['安卓', '苹果'], mockValue: '安卓' },
     { key: 'serverZone', label: '区服', required: false, type: 'select', options: ['QQ区', '微信区'], mockValue: 'QQ区' },
   ]
 }

apps/backend/src/services/worker-platform/worker-platform-service.test.ts

@@ -83,11 +83,11 @@ test('normalizeRequirementFields default template keeps gameId/gameNickname as t
   assert.equal(gameNickname?.required, true)
 })
 
-test('normalizeRequirementFields default template renders system as single-select 安卓/苹果', () => {
+test('normalizeRequirementFields default template renders system as single-select 安卓/苹果 (optional)', () => {
   const fields = normalizeRequirementFields([])
   const system = fields.find((field) => field.key === 'system')
   assert.equal(system?.type, 'select')
-  assert.equal(system?.required, true)
+  assert.equal(system?.required, false)
   assert.deepEqual(system?.options, ['安卓', '苹果'])
 })