fix(spp_mis_demo_v2): add spp_api_v2_gis dependency for demo API client

The demo_api_client.xml creates scopes with resource='gis', which is a
selection value registered by spp_api_v2_gis. Without this dependency,
the XML load fails with "Wrong value for spp.api.client.scope.resource: 'gis'".

Author: jeremi

spp_mis_demo_v2/__manifest__.py

@@ -24,6 +24,8 @@
         "spp_statistic",
         "spp_aggregation",
         "spp_studio",
+        # GIS API for QGIS plugin (registers 'gis' scope for demo API client)
+        "spp_api_v2_gis",
         # QR Credentials (Claim 169)
         "spp_claim_169",
         # Demo-specific extensions