feat: pace startup housekeeper runs

src/ccma/ui/splash.py

@@ -119,10 +119,16 @@ class SplashScreen(tk.Toplevel):
                 errors = self.repository.validate()
                 self._messages.put(("status", "Baue Suchindex …"))
                 self.repository.list_members()
+                member_count = len(self.repository.list_member_ids())
                 findings = []
                 if self.run_housekeeper:
                     self._messages.put(("status", "Starte Hausmeister …"))
-                    findings = Housekeeper(self.repository, self.housekeeper_settings).run()
+                    findings = Housekeeper(self.repository, self.housekeeper_settings).run(
+                        member_delay=_member_delay_for_splash(
+                            self.minimum_display_seconds,
+                            member_count,
+                        )
+                    )
                 result = StartupResult(self.repository, errors, findings)
                 self._messages.put(("result", result))
             except Exception as exc:
@@ -265,3 +271,9 @@ def _progress_value(elapsed: float, minimum_seconds: float, startup_finished: bo
     if startup_finished:
         return elapsed_ratio * 100.0
     return elapsed_ratio * 95.0
+
+
+def _member_delay_for_splash(minimum_seconds: float, member_count: int) -> float:
+    if minimum_seconds <= 0 or member_count <= 0:
+        return 0.0
+    return minimum_seconds / member_count