Add plugin platform with modular backend and frontend registry.

Split graph/import/meta into Django apps, add API v1 with OpenAPI and pytest, and introduce plugin registry with the tags reference plugin on both FE and BE.

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

frontend/src/components/ContactForm.vue

@@ -45,6 +45,13 @@
       <label>Заметки</label>
       <textarea v-model="form.notes" class="form-control" placeholder="Дополнительная информация..." rows="3"></textarea>
     </div>
+    <component
+      :is="Ext"
+      v-for="(Ext, index) in contactFormExtensions"
+      :key="index"
+      :contact-id="initial?.id"
+      v-model="pluginTags"
+    />
     <div class="contact-form-footer">
       <button
         v-if="showDelete"
@@ -63,9 +70,10 @@
 </template>
 
 <script setup>
-import { reactive, watch, computed, onMounted } from 'vue'
+import { reactive, ref, watch, computed, onMounted } from 'vue'
 import { useNetworkMapsStore } from '../stores/networkMaps'
 import { listMembershipsByContact } from '../application/usecases/networkMaps'
+import { getContactFormExtensions } from '../core/pluginRegistry'
 
 const props = defineProps({
   initial: { type: Object, default: () => ({}) },
@@ -75,6 +83,8 @@ const props = defineProps({
 const emit = defineEmits(['submit', 'cancel', 'delete'])
 
 const mapsStore = useNetworkMapsStore()
+const contactFormExtensions = getContactFormExtensions()
+const pluginTags = ref([])
 
 const showDelete = computed(() => {
   if (props.deletable) return true
@@ -140,7 +150,7 @@ onMounted(async () => {
 
 function onSubmit() {
   const { mapIds, ...contactData } = form
-  emit('submit', contactData, mapIds)
+  emit('submit', contactData, mapIds, { tags: [...pluginTags.value] })
 }
 </script>