feat: update area management to implement hard delete and adjust related references

docs/API_SPEC.md

@@ -46,7 +46,7 @@ Authorization: Bearer <token>
 
 ## Public Reference / Public Access
 - `GET /areas`
-  active municipal areas
+  municipal areas
 - `GET /interventions/{token}`
   public external-team summary link
 - `GET /open-data/reports`
@@ -115,6 +115,7 @@ Authorization: Bearer <token>
 - `POST /admin/areas`
 - `PATCH /admin/areas/{id}`
 - `DELETE /admin/areas/{id}`
+  deletes area and clears linked `reports.area_id` and `teams.area_id`
   area polygon must stay inside allowed Bari municipal boundary
 - `POST /admin/teams`
 - `PATCH /admin/teams/{id}`