Add origin field and filter for ban sources (Tasks 1 & 2)

- Task 1: Mark imported blocklist IP addresses
  - Add BanOrigin type and _derive_origin() to ban.py model
  - Populate origin field in ban_service list_bans() and bans_by_country()
  - BanTable and MapPage companion table show origin badge column
  - Tests: origin derivation in test_ban_service.py and test_dashboard.py

- Task 2: Add origin filter to dashboard and world map
  - ban_service: _origin_sql_filter() helper; origin param on list_bans()
    and bans_by_country()
  - dashboard router: optional origin query param forwarded to service
  - Frontend: BanOriginFilter type + BAN_ORIGIN_FILTER_LABELS in ban.ts
  - fetchBans / fetchBansByCountry forward origin to API
  - useBans / useMapData accept and pass origin; page resets on change
  - BanTable accepts origin prop; DashboardPage adds segmented filter
  - MapPage adds origin Select next to time-range picker
  - Tests: origin filter assertions in test_ban_service and test_dashboard

frontend/src/hooks/useMapData.ts

@@ -5,6 +5,7 @@
 import { useCallback, useEffect, useRef, useState } from "react";
 import { fetchBansByCountry } from "../api/map";
 import type { BansByCountryResponse, MapBanItem, TimeRange } from "../types/map";
+import type { BanOriginFilter } from "../types/ban";
 
 // ---------------------------------------------------------------------------
 // Return type
@@ -31,7 +32,10 @@ export interface UseMapDataResult {
 // Hook
 // ---------------------------------------------------------------------------
 
-export function useMapData(range: TimeRange = "24h"): UseMapDataResult {
+export function useMapData(
+  range: TimeRange = "24h",
+  origin: BanOriginFilter = "all",
+): UseMapDataResult {
   const [data, setData] = useState<BansByCountryResponse | null>(null);
   const [loading, setLoading] = useState(true);
   const [error, setError] = useState<string | null>(null);
@@ -43,7 +47,7 @@ export function useMapData(range: TimeRange = "24h"): UseMapDataResult {
     setLoading(true);
     setError(null);
 
-    fetchBansByCountry(range)
+    fetchBansByCountry(range, origin)
       .then((resp) => {
         setData(resp);
       })
@@ -55,7 +59,7 @@ export function useMapData(range: TimeRange = "24h"): UseMapDataResult {
       .finally((): void => {
         setLoading(false);
       });
-  }, [range]);
+  }, [range, origin]);
 
   useEffect((): (() => void) => {
     load();