Add JWT auth with per-user data isolation and account settings.

Users can register, log in, and manage profile/password in a personal account page; server data is scoped by owner across contacts, maps, tags, and import.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/lib/api/errors.js

@@ -1,13 +1,31 @@
-export function normalizeApiError(error) {
-  const status = error?.response?.status ?? null
-  const data = error?.response?.data
-  let message = 'Произошла ошибка запроса.'
+export function formatApiErrorData(data) {
+  if (!data) return ''
+  if (typeof data === 'string' && data.trim()) return data.trim()
+  if (typeof data?.detail === 'string' && data.detail.trim()) return data.detail.trim()
+  if (Array.isArray(data?.non_field_errors) && data.non_field_errors.length) {
+    return data.non_field_errors.join('; ')
+  }
+  if (typeof data === 'object') {
+    return Object.entries(data)
+      .map(([key, value]) => {
+        if (Array.isArray(value)) return `${key}: ${value.join(', ')}`
+        if (typeof value === 'string') return `${key}: ${value}`
+        return `${key}: ${JSON.stringify(value)}`
+      })
+      .join('; ')
+  }
+  return ''
+}
 
-  if (typeof data === 'string' && data.trim()) {
-    message = data
-  } else if (typeof data?.error === 'string' && data.error.trim()) {
+export function normalizeApiError(error) {
+  const status = error?.response?.status ?? error?.status ?? null
+  const data = error?.response?.data ?? error?.data
+  const formatted = formatApiErrorData(data)
+  let message = formatted || 'Произошла ошибка запроса.'
+
+  if (!formatted && typeof data?.error === 'string' && data.error.trim()) {
     message = data.error
-  } else if (typeof error?.message === 'string' && error.message.trim()) {
+  } else if (!formatted && typeof error?.message === 'string' && error.message.trim()) {
     message = error.message
   }