Add multiple network maps, graph UX improvements, and full backup import.

Support per-map contact membership with scoped graph views, relation editing on edges, layout caching, and automatic detection of full JSON backups so contacts and relations import together.

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

frontend/src/infrastructure/repositories/networkMapRepository.remote.js

@@ -0,0 +1,23 @@
+import api from '../../api'
+import { fetchAllPages } from '../../lib/api/pagination'
+
+export const remoteNetworkMapRepository = {
+  async list() {
+    return fetchAllPages((page) => api.get('/network-maps/', { params: { page } }))
+  },
+  async getById(id) {
+    const { data } = await api.get(`/network-maps/${id}/`)
+    return data
+  },
+  async create(payload) {
+    const { data } = await api.post('/network-maps/', payload)
+    return data
+  },
+  async update(id, payload) {
+    const { data } = await api.patch(`/network-maps/${id}/`, payload)
+    return data
+  },
+  async remove(id) {
+    await api.delete(`/network-maps/${id}/`)
+  },
+}