task-2: buildJavaUrl() 统一 URL 构造（query 编码、尾斜杠规范化）

frontend-vue/src/shared/api/url.ts

@@ -0,0 +1,25 @@
+/** Java 主后端 URL 构造：常量表值已含 /api 前缀，此处只加 /newApi 网关前缀 */
+export const JAVA_API_PREFIX = '/newApi/api'
+
+function buildQueryString(query?: Record<string, unknown>): string {
+  if (!query) return ''
+  const params = new URLSearchParams()
+  for (const [key, value] of Object.entries(query)) {
+    if (value !== undefined && value !== null) {
+      params.append(key, String(value))
+    }
+  }
+  const text = params.toString().replace(/\+/g, '%20')
+  return text ? `?${text}` : ''
+}
+
+export function buildJavaUrl(
+  endpoint: string,
+  query?: Record<string, unknown>,
+): string {
+  const normalized = endpoint.endsWith('/') ? endpoint.slice(0, -1) : endpoint
+  const prefix = normalized.startsWith('/api')
+    ? '/newApi'
+    : JAVA_API_PREFIX
+  return `${prefix}${normalized}${buildQueryString(query)}`
+}