add name EN/JP fields to character detail and edit pages

src/lib/features/database/characters/sections/CharacterMetadataSection.svelte

@@ -78,6 +78,20 @@
 
 <DetailsContainer title="Metadata">
   {#if editMode}
+    <DetailItem
+      label="Name (EN)"
+      bind:value={editData.name}
+      editable={true}
+      type="text"
+      placeholder="English name"
+    />
+    <DetailItem
+      label="Name (JP)"
+      bind:value={editData.nameJp}
+      editable={true}
+      type="text"
+      placeholder="日本語名"
+    />
     <SuggestionDetailItem
       label="Rarity"
       bind:value={editData.rarity}
@@ -143,6 +157,8 @@
       />
     </DetailItem>
   {:else}
+    <DetailItem label="Name (EN)" value={character.name?.en || '—'} />
+    <DetailItem label="Name (JP)" value={character.name?.ja || '—'} />
     <DetailItem label="Rarity" value={getRarityLabel(character.rarity)} />
     <DetailItem label="Granblue ID">
       {#if character.granblueId}

src/routes/(app)/database/characters/[granblueId]/edit/+page.svelte

@@ -57,6 +57,7 @@
 	// Editable fields - initialized from character data
 	let editData = $state({
 		name: '',
+		nameJp: '',
 		granblueId: '',
 		characterId: '', // Comma-separated string for dual/trio units
 		rarity: 1,
@@ -126,6 +127,7 @@
 		if (character) {
 			editData = {
 				name: character.name?.en || '',
+				nameJp: character.name?.ja || '',
 				granblueId: character.granblueId || '',
 				characterId: character.characterId?.join(', ') || '',
 				rarity: character.rarity || 1,
@@ -183,6 +185,7 @@
 			// Prepare the data for API (flat snake_case format)
 			const payload = {
 				name_en: editData.name,
+				name_jp: editData.nameJp,
 				granblue_id: editData.granblueId,
 				character_id:
 					editData.characterId.trim() === ''