refactor: reorganize proto clients and settings UI

Move generated proto imports under the new server api path and align gRPC auth/client usage with the renamed clients. Polish settings UI details by adding a shared language icon and refining Ads VAST table presentation.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/icons/LanguageIcon.vue

@@ -0,0 +1,19 @@
+<template>
+    <svg v-if="filled" aria-hidden="true" aria-label="" class="v-mid m-a" height="24" role="img" viewBox="0 0 468 468"
+        width="24">
+        <path
+            d="M42 74v320c0 18 14 32 32 32h320c18 0 32-14 32-32V74c0-18-14-32-32-32H74c-18 0-32 14-32 32zm80 160c0-9 7-16 16-16h80v-80c0-9 7-16 16-16s16 7 16 16v80h80c9 0 16 7 16 16s-7 16-16 16h-80v80c0 9-7 16-16 16s-16-7-16-16v-80h-80c-9 0-16-7-16-16z"
+            fill="#a6acb9" />
+        <path
+            d="M74 42c-18 0-32 14-32 32v320c0 18 14 32 32 32h320c18 0 32-14 32-32V74c0-18-14-32-32-32H74zM10 74c0-35 29-64 64-64h320c35 0 64 29 64 64v320c0 35-29 64-64 64H74c-35 0-64-29-64-64V74zm208 256v-80h-80c-9 0-16-7-16-16s7-16 16-16h80v-80c0-9 7-16 16-16s16 7 16 16v80h80c9 0 16 7 16 16s-7 16-16 16h-80v80c0 9-7 16-16 16s-16-7-16-16z"
+            fill="currentColor" />
+    </svg>
+    <svg v-else xmlns="http://www.w3.org/2000/svg" class="v-mid m-a" height="24" viewBox="-10 -226 468 468">
+        <path
+            d="M64-184c-18 0-32 14-32 32v320c0 18 14 32 32 32h320c18 0 32-14 32-32v-320c0-18-14-32-32-32H64zM0-152c0-35 29-64 64-64h320c35 0 64 29 64 64v320c0 35-29 64-64 64H64c-35 0-64-29-64-64v-320zm208 256V24h-80c-9 0-16-7-16-16s7-16 16-16h80v-80c0-9 7-16 16-16s16 7 16 16v80h80c9 0 16 7 16 16s-7 16-16 16h-80v80c0 9-7 16-16 16s-16-7-16-16z"
+            fill="currentColor" />
+    </svg>
+</template>
+<script lang="ts" setup>
+defineProps<{  filled?: boolean }>();
+</script>