Add issue resolution confirmation workflow

backend/app/routers/admin.py

@@ -234,6 +234,9 @@ SETTING_KEYS: List[str] = [
     "requests_cleanup_time",
     "requests_cleanup_days",
     "requests_data_source",
+    "issue_confirmation_contact_attempts",
+    "issue_confirmation_interval_value",
+    "issue_confirmation_interval_unit",
     "site_banner_enabled",
     "site_banner_message",
     "site_banner_tone",
@@ -661,6 +664,26 @@ async def update_settings(payload: Dict[str, Any]) -> Dict[str, Any]:
             changed_keys.append(key)
             continue
         value_to_store = str(value).strip() if isinstance(value, str) else str(value)
+        if key == "issue_confirmation_contact_attempts":
+            try:
+                attempts = int(value_to_store)
+            except (TypeError, ValueError) as exc:
+                raise HTTPException(status_code=400, detail="Confirmation contacts must be a whole number from 0 to 10") from exc
+            if attempts < 0 or attempts > 10:
+                raise HTTPException(status_code=400, detail="Confirmation contacts must be from 0 to 10")
+            value_to_store = str(attempts)
+        if key == "issue_confirmation_interval_value":
+            try:
+                interval_value = int(value_to_store)
+            except (TypeError, ValueError) as exc:
+                raise HTTPException(status_code=400, detail="Confirmation interval must be a whole number") from exc
+            if interval_value < 1 or interval_value > 365:
+                raise HTTPException(status_code=400, detail="Confirmation interval must be from 1 to 365")
+            value_to_store = str(interval_value)
+        if key == "issue_confirmation_interval_unit":
+            value_to_store = value_to_store.lower()
+            if value_to_store not in {"days", "weeks", "months"}:
+                raise HTTPException(status_code=400, detail="Confirmation interval unit must be days, weeks, or months")
         if key in URL_SETTING_KEYS and value_to_store:
             try:
                 value_to_store = _normalize_service_url(value_to_store)