feat(admin): add excel upload flows for FNS reports and register lists

src/templates/admin/parsers/financialreport/change_list.html

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+{% extends "admin/change_list.html" %}
+
+{% block object-tools-items %}
+  <li>
+    <a href="{{ upload_excel_url }}" class="addlink">Загрузить Excel ФНС</a>
+  </li>
+  {{ block.super }}
+{% endblock %}

src/templates/admin/parsers/financialreport/upload_excel.html

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+{% extends "admin/base_site.html" %}
+
+{% block breadcrumbs %}
+  <div class="breadcrumbs">
+    <a href="{% url 'admin:index' %}">Главная</a>
+    &rsaquo; <a href="{{ changelist_url }}">Финансовые отчеты ФНС</a>
+    &rsaquo; Загрузка Excel
+  </div>
+{% endblock %}
+
+{% block content %}
+  <div id="content-main">
+    <form method="post" enctype="multipart/form-data">
+      {% csrf_token %}
+      <fieldset class="module aligned">
+        <div class="form-row">
+          <label for="id_files" class="required">Excel файлы:</label>
+          <input
+            type="file"
+            name="files"
+            id="id_files"
+            accept=".xlsx"
+            multiple
+            required
+          />
+          <p class="help">Ожидаемый формат имени: fin_{id}_{ogrn}.xlsx</p>
+        </div>
+      </fieldset>
+
+      <div class="submit-row">
+        <input type="submit" value="Загрузить" class="default" />
+        <a href="{{ changelist_url }}" class="closelink">Отмена</a>
+      </div>
+    </form>
+  </div>
+{% endblock %}

src/templates/admin/registers/registerupload/change_list.html

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+{% extends "admin/change_list.html" %}
+
+{% block object-tools-items %}
+  <li>
+    <a href="{{ upload_excel_url }}" class="addlink">Загрузить Excel организаций</a>
+  </li>
+  {{ block.super }}
+{% endblock %}

src/templates/admin/registers/registerupload/upload_excel.html

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+{% extends "admin/base_site.html" %}
+
+{% block breadcrumbs %}
+  <div class="breadcrumbs">
+    <a href="{% url 'admin:index' %}">Главная</a>
+    &rsaquo; <a href="{{ changelist_url }}">Загрузки реестров</a>
+    &rsaquo; Загрузка Excel
+  </div>
+{% endblock %}
+
+{% block content %}
+  <div id="content-main">
+    <form method="post" enctype="multipart/form-data">
+      {% csrf_token %}
+      <fieldset class="module aligned">
+        <div class="form-row">
+          <label for="id_registry" class="required">Реестр:</label>
+          <select name="registry" id="id_registry" required>
+            <option value="">---------</option>
+            {% for registry in registries %}
+              <option value="{{ registry.id }}">{{ registry.name }}</option>
+            {% endfor %}
+          </select>
+        </div>
+
+        <div class="form-row">
+          <label for="id_actual_date">Дата актуальности:</label>
+          <input type="date" name="actual_date" id="id_actual_date" />
+          <p class="help">Если не указана, будет использована текущая дата.</p>
+        </div>
+
+        <div class="form-row">
+          <label for="id_file" class="required">Excel файл:</label>
+          <input type="file" name="file" id="id_file" accept=".xlsx" required />
+          <p class="help">
+            Ожидаемые колонки: pn_name, mn_ogrn, mn_inn, mn_okpo. Опционально: in_kpp.
+          </p>
+        </div>
+      </fieldset>
+
+      <div class="submit-row">
+        <input type="submit" value="Загрузить" class="default" />
+        <a href="{{ changelist_url }}" class="closelink">Отмена</a>
+      </div>
+    </form>
+  </div>
+{% endblock %}