fix(tenancy): use correct base URL for invitation link in dev vs prod

Dev (debug=True): http://localhost:8000/store/{store_code}/invitation/...
Prod: https://{subdomain}.{main_domain}/invitation/...

Previously used main_domain directly which pointed to the prod domain
even in dev environments.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/modules/tenancy/services/store_team_service.py

@@ -983,10 +983,18 @@ class StoreTeamService:
         from app.core.config import settings as app_settings
         from app.modules.messaging.services.email_service import EmailService
 
-        domain = app_settings.main_domain.rstrip("/")
-        scheme = "http" if "localhost" in domain else "https"
-        base_url = f"{scheme}://{domain}" if "://" not in domain else domain
-        acceptance_link = f"{base_url}/store/invitation/accept?token={token}"
+        # Build acceptance URL using store's subdomain or main domain
+        store_subdomain = store.subdomain
+        main_domain = app_settings.main_domain.rstrip("/")
+
+        if app_settings.debug or "localhost" in main_domain:
+            # Dev: use localhost with store path
+            base_url = f"http://localhost:8000/store/{store.store_code}"
+        else:
+            # Prod: use store subdomain
+            base_url = f"https://{store_subdomain}.{main_domain}"
+
+        acceptance_link = f"{base_url}/invitation/accept?token={token}"
 
         email_service = EmailService(db)
         email_service.send_template(