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/tests/test_services/test_history_service.py

@@ -11,6 +11,7 @@ from unittest.mock import AsyncMock, patch
 import aiosqlite
 import pytest
 
+from app.db import init_db
 from app.services import history_service
 
 # ---------------------------------------------------------------------------
@@ -264,6 +265,31 @@ class TestListHistory:
         assert result.page == 1
         assert result.page_size == 2
 
+    async def test_source_archive_reads_from_archive(self, f2b_db_path: str, tmp_path: Path) -> None:
+        """Using source='archive' reads from the BanGUI archive table."""
+        app_db_path = str(tmp_path / "app_archive.db")
+        async with aiosqlite.connect(app_db_path) as db:
+            db.row_factory = aiosqlite.Row
+            await init_db(db)
+            await db.execute(
+                "INSERT INTO history_archive (jail, ip, timeofban, bancount, data, action) VALUES (?, ?, ?, ?, ?, ?)",
+                ("sshd", "10.0.0.1", _ONE_HOUR_AGO, 1, '{"matches": [], "failures": 0}', "ban"),
+            )
+            await db.commit()
+
+            with patch(
+                "app.services.history_service.get_fail2ban_db_path",
+                new=AsyncMock(return_value=f2b_db_path),
+            ):
+                result = await history_service.list_history(
+                    "fake_socket",
+                    source="archive",
+                    db=db,
+                )
+
+        assert result.total == 1
+        assert result.items[0].ip == "10.0.0.1"
+
 
 # ---------------------------------------------------------------------------
 # get_ip_detail tests