Stage 8: world map view — backend endpoint, map component, map page

- BansByCountryResponse model added to ban.py
- bans_by_country() service: parallel geo lookup via asyncio.gather,
  aggregation by ISO alpha-2 country code (up to 2 000 bans)
- GET /api/dashboard/bans/by-country endpoint in dashboard router
- 290 tests pass (5 new), ruff + mypy clean (44 files)
- isoNumericToAlpha2.ts: 249-entry ISO numeric → alpha-2 static map
- types/map.ts, api/map.ts, hooks/useMapData.ts created
- WorldMap.tsx: react-simple-maps Mercator SVG map, per-country ban
  count overlay, colour intensity scaling, country click filtering,
  GeoLayer nested-component pattern for useGeographies context
- MapPage.tsx: time-range selector, WorldMap, country filter info bar,
  summary line, companion FluentUI Table with country filter
- Frontend tsc + ESLint clean (0 errors/warnings)

frontend/src/data/isoNumericToAlpha2.ts

@@ -0,0 +1,248 @@
+/**
+ * Static mapping from ISO 3166-1 numeric country codes (as used in the
+ * world-atlas TopoJSON data) to ISO 3166-1 alpha-2 codes (as returned by
+ * the ip-api.com geo-enrichment service).
+ *
+ * Source: ISO 3166 Maintenance Agency (iso.org)
+ */
+export const ISO_NUMERIC_TO_ALPHA2: Record<string, string> = {
+  "4": "AF",
+  "8": "AL",
+  "12": "DZ",
+  "16": "AS",
+  "20": "AD",
+  "24": "AO",
+  "28": "AG",
+  "31": "AZ",
+  "32": "AR",
+  "36": "AU",
+  "40": "AT",
+  "44": "BS",
+  "48": "BH",
+  "50": "BD",
+  "51": "AM",
+  "52": "BB",
+  "56": "BE",
+  "64": "BT",
+  "68": "BO",
+  "70": "BA",
+  "72": "BW",
+  "76": "BR",
+  "84": "BZ",
+  "86": "IO",
+  "90": "SB",
+  "96": "BN",
+  "100": "BG",
+  "104": "MM",
+  "108": "BI",
+  "112": "BY",
+  "116": "KH",
+  "120": "CM",
+  "124": "CA",
+  "132": "CV",
+  "136": "KY",
+  "140": "CF",
+  "144": "LK",
+  "148": "TD",
+  "152": "CL",
+  "156": "CN",
+  "162": "CX",
+  "166": "CC",
+  "170": "CO",
+  "174": "KM",
+  "175": "YT",
+  "178": "CG",
+  "180": "CD",
+  "184": "CK",
+  "188": "CR",
+  "191": "HR",
+  "192": "CU",
+  "196": "CY",
+  "203": "CZ",
+  "204": "BJ",
+  "208": "DK",
+  "212": "DM",
+  "214": "DO",
+  "218": "EC",
+  "222": "SV",
+  "226": "GQ",
+  "231": "ET",
+  "232": "ER",
+  "233": "EE",
+  "238": "FK",
+  "242": "FJ",
+  "246": "FI",
+  "248": "AX",
+  "250": "FR",
+  "254": "GF",
+  "258": "PF",
+  "262": "DJ",
+  "266": "GA",
+  "268": "GE",
+  "270": "GM",
+  "275": "PS",
+  "276": "DE",
+  "288": "GH",
+  "292": "GI",
+  "296": "KI",
+  "300": "GR",
+  "304": "GL",
+  "308": "GD",
+  "312": "GP",
+  "316": "GU",
+  "320": "GT",
+  "324": "GN",
+  "328": "GY",
+  "332": "HT",
+  "334": "HM",
+  "336": "VA",
+  "340": "HN",
+  "344": "HK",
+  "348": "HU",
+  "352": "IS",
+  "356": "IN",
+  "360": "ID",
+  "364": "IR",
+  "368": "IQ",
+  "372": "IE",
+  "376": "IL",
+  "380": "IT",
+  "388": "JM",
+  "392": "JP",
+  "398": "KZ",
+  "400": "JO",
+  "404": "KE",
+  "408": "KP",
+  "410": "KR",
+  "414": "KW",
+  "417": "KG",
+  "418": "LA",
+  "422": "LB",
+  "426": "LS",
+  "428": "LV",
+  "430": "LR",
+  "434": "LY",
+  "438": "LI",
+  "440": "LT",
+  "442": "LU",
+  "446": "MO",
+  "450": "MG",
+  "454": "MW",
+  "458": "MY",
+  "462": "MV",
+  "466": "ML",
+  "470": "MT",
+  "474": "MQ",
+  "478": "MR",
+  "480": "MU",
+  "484": "MX",
+  "492": "MC",
+  "496": "MN",
+  "498": "MD",
+  "499": "ME",
+  "500": "MS",
+  "504": "MA",
+  "508": "MZ",
+  "512": "OM",
+  "516": "NA",
+  "520": "NR",
+  "524": "NP",
+  "528": "NL",
+  "531": "CW",
+  "533": "AW",
+  "534": "SX",
+  "535": "BQ",
+  "540": "NC",
+  "548": "VU",
+  "554": "NZ",
+  "558": "NI",
+  "562": "NE",
+  "566": "NG",
+  "570": "NU",
+  "574": "NF",
+  "578": "NO",
+  "580": "MP",
+  "583": "FM",
+  "584": "MH",
+  "585": "PW",
+  "586": "PK",
+  "591": "PA",
+  "598": "PG",
+  "600": "PY",
+  "604": "PE",
+  "608": "PH",
+  "612": "PN",
+  "616": "PL",
+  "620": "PT",
+  "624": "GW",
+  "626": "TL",
+  "630": "PR",
+  "634": "QA",
+  "638": "RE",
+  "642": "RO",
+  "643": "RU",
+  "646": "RW",
+  "652": "BL",
+  "654": "SH",
+  "659": "KN",
+  "660": "AI",
+  "662": "LC",
+  "663": "MF",
+  "666": "PM",
+  "670": "VC",
+  "674": "SM",
+  "678": "ST",
+  "682": "SA",
+  "686": "SN",
+  "688": "RS",
+  "690": "SC",
+  "694": "SL",
+  "703": "SK",
+  "704": "VN",
+  "705": "SI",
+  "706": "SO",
+  "710": "ZA",
+  "716": "ZW",
+  "724": "ES",
+  "728": "SS",
+  "729": "SD",
+  "732": "EH",
+  "736": "SD",
+  "740": "SR",
+  "744": "SJ",
+  "748": "SZ",
+  "752": "SE",
+  "756": "CH",
+  "760": "SY",
+  "762": "TJ",
+  "764": "TH",
+  "768": "TG",
+  "772": "TK",
+  "776": "TO",
+  "780": "TT",
+  "784": "AE",
+  "788": "TN",
+  "792": "TR",
+  "795": "TM",
+  "796": "TC",
+  "798": "TV",
+  "800": "UG",
+  "804": "UA",
+  "807": "MK",
+  "818": "EG",
+  "826": "GB",
+  "831": "GG",
+  "832": "JE",
+  "833": "IM",
+  "834": "TZ",
+  "840": "US",
+  "850": "VI",
+  "854": "BF",
+  "858": "UY",
+  "860": "UZ",
+  "862": "VE",
+  "876": "WF",
+  "882": "WS",
+  "887": "YE",
+  "894": "ZM",
+};