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/components/hermes/profiles/ProfileCreateModal.vue

@@ -69,7 +69,7 @@ function handleClose() {
         <NInput
           :value="name"
           :placeholder="t('profiles.namePlaceholder')"
-          @input="name = $event.replace(/[^a-zA-Z0-9_-]/g, '')"
+          @input="name = $event.toLowerCase().replace(/[^a-z0-9_-]/g, '')"
           @keyup.enter="handleSave"
         />
       </NFormItem>

packages/client/src/components/hermes/profiles/ProfileRenameModal.vue

@@ -56,8 +56,9 @@ function handleClose() {
     <NForm label-placement="top">
       <NFormItem :label="t('profiles.newName')" required>
         <NInput
-          v-model:value="newName"
+          :value="newName"
           :placeholder="t('profiles.newNamePlaceholder')"
+          @input="newName = $event.toLowerCase().replace(/[^a-z0-9_-]/g, '')"
           @keyup.enter="handleSave"
         />
       </NFormItem>