Refresh active crewed mission cache in updater

Closes #175

update.py

@@ -264,6 +264,12 @@ def update_thespacedevs(config: flask.config.Config) -> None:
     existing_data = agenda.thespacedevs.load_cached_launches(rocket_dir)
     assert existing_data
 
+    # Refresh active crewed mission cache used by the launches page.
+    # Failures are handled internally with cache fallback.
+    active_crewed = agenda.thespacedevs.get_active_crewed_flights(
+        rocket_dir, refresh=True
+    )
+
     # Always follow configured slugs
     follow_slugs: set[str] = set(config["FOLLOW_LAUNCHES"])
 
@@ -313,6 +319,7 @@ def update_thespacedevs(config: flask.config.Config) -> None:
         return
     rockets = [agenda.thespacedevs.summarize_launch(item) for item in data["results"]]
     print(len(rockets), "launches")
+    print(len(active_crewed or []), "active crewed missions")
     print(f"took {time_taken:.1f} seconds")