characters: add nicknames to creation page

Backfill nicknames support to character creation page:
- Add nicknamesEn and nicknamesJp fields to editData
- Import and use TagInput component for nickname entry
- Add nicknames section to form UI
- Update CreateCharacterPayload interface with nickname fields

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

src/lib/api/adapters/entity.adapter.ts

@@ -240,6 +240,8 @@ export interface CreateCharacterPayload {
 	wiki_ja?: string
 	gamewith?: string
 	kamigame?: string
+	nicknames_en?: string[]
+	nicknames_jp?: string[]
 }
 
 /**

src/routes/(app)/database/characters/new/+page.svelte

@@ -13,6 +13,7 @@
 	import SidebarHeader from '$lib/components/ui/SidebarHeader.svelte'
 	import Button from '$lib/components/ui/Button.svelte'
 	import ValidatedInput from '$lib/components/ui/ValidatedInput.svelte'
+	import TagInput from '$lib/components/ui/TagInput.svelte'
 	import { entityAdapter } from '$lib/api/adapters/entity.adapter'
 	import { getRarityOptions } from '$lib/utils/rarity'
 
@@ -93,7 +94,11 @@
 		wikiEn: '',
 		wikiJa: '',
 		gamewith: '',
-		kamigame: ''
+		kamigame: '',
+
+		// Nicknames
+		nicknamesEn: [] as string[],
+		nicknamesJp: [] as string[]
 	})
 
 	const rarityOptions = getRarityOptions()
@@ -201,7 +206,11 @@
 				wiki_en: editData.wikiEn,
 				wiki_ja: editData.wikiJa,
 				gamewith: editData.gamewith,
-				kamigame: editData.kamigame
+				kamigame: editData.kamigame,
+
+				// Nicknames
+				nicknames_en: editData.nicknamesEn,
+				nicknames_jp: editData.nicknamesJp
 			}
 
 			const newCharacter = await entityAdapter.createCharacter(payload)
@@ -287,6 +296,15 @@
 		<CharacterTaxonomySection character={emptyCharacter} {editMode} bind:editData />
 		<CharacterStatsSection character={emptyCharacter} {editMode} bind:editData />
 
+		<DetailsContainer title="Nicknames">
+			<DetailItem label="Nicknames (EN)">
+				<TagInput bind:value={editData.nicknamesEn} placeholder="Add nickname..." />
+			</DetailItem>
+			<DetailItem label="Nicknames (JP)">
+				<TagInput bind:value={editData.nicknamesJp} placeholder="ニックネーム..." />
+			</DetailItem>
+		</DetailsContainer>
+
 		<DetailsContainer title="Dates">
 			<DetailItem
 				label="Release Date"