feat(admin-ui): load and edit router config from forms

Add a form-first LLM/TTS router config editor and a redacted admin config snapshot so operators can inspect configKV state before applying changes.

Preserve existing encrypted key entries when loaded slices are submitted without new plaintext keys.

Signed-off-by: RainbowBird <git@luoling.moe>
Commit-Message-Assisted-by: Claude (via Claude Code)

packages/ui/src/components/form/field/field-input.vue

@@ -27,6 +27,7 @@ const props = withDefaults(defineProps<{
    */
   hideRequiredMark?: boolean
   type?: InputType
+  autocomplete?: string
   inputClass?: string
   singleLine?: boolean
 }>(), {
@@ -57,6 +58,7 @@ const modelValue = defineModel<T>({ required: false })
         v-model.number="modelValue"
         :type="props.type"
         :placeholder="props.placeholder"
+        :autocomplete="props.autocomplete"
         :required="props.required"
         :class="props.inputClass"
       />
@@ -65,6 +67,7 @@ const modelValue = defineModel<T>({ required: false })
         v-model="modelValue"
         :type="props.type"
         :placeholder="props.placeholder"
+        :autocomplete="props.autocomplete"
         :required="props.required"
         :class="props.inputClass"
       />
@@ -73,6 +76,7 @@ const modelValue = defineModel<T>({ required: false })
         v-model="modelValue as string | undefined"
         :type="props.type"
         :placeholder="props.placeholder"
+        :autocomplete="props.autocomplete"
         :required="props.required"
         :class="[
           props.inputClass,