feat: 补全皮肤站管理台 Mod 页上传与批量操作

- 新增 Mod 上传弹窗：拖拽或选择 .jar、多文件、大小限制、规则标签附加
- 上传流程：xxHash64 查重、同名检测、名称冲突确认（覆盖/跳过）、429 限流退避重试、HashDiff 重传
- Mod 列表支持多选模式：全选本页、取消选择、批量删除
- 新增服务器地址过滤，配合名称搜索与标签筛选
- 补充 Mod 相关 API：文件哈希、按哈希/名称查重、上传、批量更新
- 引入 xxhash-wasm 依赖
- 中英文各补 32 个文案

apps/app-frontend/src/helpers/skin-site-api.ts

@@ -2015,3 +2015,59 @@ export function skinSiteAdminInviteUser(email: string): Promise<SkinSiteResponse
 		body: { email },
 	})
 }
+
+export function skinSiteModHashFromFile(file: File): Promise<string> {
+	return import('xxhash-wasm').then(async ({ default: xxhash }) => {
+		const { create64 } = await xxhash()
+		const hasher = create64()
+		const reader = file.stream().getReader()
+		for (;;) {
+			const { done, value } = await reader.read()
+			if (done) break
+			hasher.update(value)
+		}
+		const raw: bigint = hasher.digest()
+		const mask = (1n << 64n) - 1n
+		const v = raw & mask
+		const signed = v >= 1n << 63n ? v - (1n << 64n) : v
+		return signed.toString()
+	})
+}
+
+export function skinSiteModExistsByHash(hash: string): Promise<SkinSiteResponse<unknown>> {
+	return skinSiteRequest<unknown>('query/hash/' + encodeURIComponent(hash), { type: 'mod' })
+}
+
+export function skinSiteModExistsByName(modName: string): Promise<SkinSiteResponse<unknown>> {
+	const q = new URLSearchParams({ mod_name: modName })
+	return skinSiteRequest<unknown>('query/name?' + q.toString(), { type: 'mod' })
+}
+
+export async function skinSiteUploadMod(
+	file: File,
+	ruleTagIds: number[] = [],
+	overwrite = false,
+): Promise<SkinSiteResponse<string>> {
+	const hash = await skinSiteModHashFromFile(file)
+	const form = new FormData()
+	form.append('mods', file, file.name)
+	const query = new URLSearchParams()
+	if (ruleTagIds.length) query.set('rule_tag_ids', ruleTagIds.join(','))
+	if (overwrite) query.set('overwrite', 'true')
+	const suffix = query.size ? '?' + query.toString() : ''
+	return skinSiteRequest<string>('upload/' + hash + suffix, {
+		method: 'POST',
+		type: 'mod',
+		form,
+	})
+}
+
+export function skinSiteUpdateMultiModInfo(
+	mods: SkinSiteModInfo[],
+): Promise<SkinSiteResponse<SkinSiteModInfo[]>> {
+	return skinSiteRequest<SkinSiteModInfo[]>('update/info/multi', {
+		method: 'POST',
+		type: 'mod',
+		body: mods,
+	})
+}