fix(profiles): normalize profile names to lowercase before sending to hermes-agent (#302)

Profile name inputs accepted uppercase letters (e.g. 'MyConfig') but
hermes-agent's backend validation only allows [a-z0-9_-], causing
'Invalid profile name' errors when creating or renaming profiles.

Changes:
- ProfileCreateModal: filter and lowercase input on @input
- ProfileRenameModal: same fix + change from v-model to :value + @input
- en.ts: update placeholder text to clarify 'lowercase letters'
- zh.ts: update placeholder text to clarify '小写字母'

Before: input 'MyConfig' was sent unchanged → backend error
After:  input 'MyConfig' is normalized to 'myconfig' → success

Co-authored-by: HJW <hujingwen@hermes.ai>

packages/client/src/i18n/locales/zh.ts

@@ -358,9 +358,9 @@ export default {
     importSelectFile: '选择归档文件',
     importInvalidFile: '请选择有效的归档文件 (.tar.gz, .tgz, .gz, .zip)',
     name: '配置名称',
-    namePlaceholder: '仅限英文、数字、连字符',
+    namePlaceholder: '仅限小写字母、数字、连字符',
     newName: '新名称',
-    newNamePlaceholder: '输入新名称',
+    newNamePlaceholder: '小写字母、数字、连字符',
     cloneFromCurrent: '从当前配置克隆',
     cloneCleanupNotice: '克隆时会自动跳过独占型平台凭据（Weixin / Telegram / Slack 等），避免与源配置冲突',
     cloneStrippedCredentials: '已清理 {count} 项独占凭据：{list}',