Complete history archive support for dashboard/map data and mark task finished

Add source=archive option for dashboard endpoints and history service; update Docs/Tasks.md; include archive branch for list_bans, bans_by_country, ban_trend, bans_by_jail; tests for archive paths.

backend/app/main.py

@@ -48,7 +48,7 @@ from app.routers import (
     server,
     setup,
 )
-from app.tasks import blocklist_import, geo_cache_flush, geo_re_resolve, health_check
+from app.tasks import blocklist_import, geo_cache_flush, geo_re_resolve, health_check, history_sync
 from app.utils.fail2ban_client import Fail2BanConnectionError, Fail2BanProtocolError
 from app.utils.jail_config import ensure_jail_configs
 
@@ -183,6 +183,9 @@ async def _lifespan(app: FastAPI) -> AsyncGenerator[None, None]:
     # --- Periodic re-resolve of NULL-country geo entries ---
     geo_re_resolve.register(app)
 
+    # --- Periodic history sync from fail2ban into BanGUI archive ---
+    history_sync.register(app)
+
     log.info("bangui_started")
 
     try: