feat: add coordinates for 145 countries for GeoDNS fallback

Expanded LOCATION_COORDINATES from 22 to 145 countries covering:
- All European countries (East and West)
- All CIS countries
- Major Asian countries
- Middle East countries
- North and South America
- Major African countries
- Oceania

This enables coordinate-based fallback for GeoDNS when no exact agent
exists in the client's country. Clients from any country will now get
the nearest agent based on geographic distance.

Examples:
- Belarus (BY) -> nearest agent (DE, RU, PL)
- Lithuania (LT) -> nearest agent (DE, PL)
- France (FR) -> nearest agent (DE, IT, NL)
- China (CN) -> nearest agent (HK, JP, SG)

Author: Rxflex

dns/geo.go

@@ -8,29 +8,171 @@ type Coordinates struct {
 	Lon float64
 }
 
+// LOCATION_COORDINATES contains coordinates for all countries to enable
+// coordinate-based fallback for GeoDNS when no exact agent match exists
 var LOCATION_COORDINATES = map[string]Coordinates{
-	"us": {Lat: 37.0902, Lon: -95.7129},
-	"de": {Lat: 51.1657, Lon: 10.4515},
-	"cz": {Lat: 49.8175, Lon: 15.4730},
-	"ru": {Lat: 61.5240, Lon: 105.3188},
-	"kz": {Lat: 48.0196, Lon: 66.9237},
-	"ua": {Lat: 48.3794, Lon: 31.1656},
-	"by": {Lat: 53.7098, Lon: 27.9534},
-	"pl": {Lat: 51.9194, Lon: 19.1451},
-	"gb": {Lat: 55.3781, Lon: -3.4360},
-	"fr": {Lat: 46.2276, Lon: 2.2137},
-	"it": {Lat: 41.8719, Lon: 12.5674},
-	"es": {Lat: 40.4637, Lon: -3.7492},
-	"nl": {Lat: 52.1326, Lon: 5.2913},
-	"jp": {Lat: 36.2048, Lon: 138.2529},
-	"hk": {Lat: 22.3193, Lon: 114.1694},
-	"sg": {Lat: 1.3521, Lon: 103.8198},
-	"au": {Lat: -25.2744, Lon: 133.7751},
-	"br": {Lat: -14.2350, Lon: -51.9253},
-	"in": {Lat: 20.5937, Lon: 78.9629},
-	"tr": {Lat: 38.9637, Lon: 35.2433},
-	"az": {Lat: 40.1431, Lon: 47.5769}, // Azerbaijan
+	// North America
+	"us": {Lat: 37.0902, Lon: -95.7129},  // United States
+	"ca": {Lat: 56.1304, Lon: -106.3468}, // Canada
+	"mx": {Lat: 23.6345, Lon: -102.5528}, // Mexico
+
+	// Europe
+	"de": {Lat: 51.1657, Lon: 10.4515}, // Germany
+	"fr": {Lat: 46.2276, Lon: 2.2137},  // France
+	"gb": {Lat: 55.3781, Lon: -3.4360}, // United Kingdom
+	"it": {Lat: 41.8719, Lon: 12.5674}, // Italy
+	"es": {Lat: 40.4637, Lon: -3.7492}, // Spain
+	"nl": {Lat: 52.1326, Lon: 5.2913},  // Netherlands
 	"be": {Lat: 50.8503, Lon: 4.3517},  // Belgium
+	"ch": {Lat: 46.8182, Lon: 8.2275},  // Switzerland
+	"at": {Lat: 47.5162, Lon: 14.5501}, // Austria
+	"pl": {Lat: 51.9194, Lon: 19.1451}, // Poland
+	"cz": {Lat: 49.8175, Lon: 15.4730}, // Czech Republic
+	"se": {Lat: 60.1282, Lon: 18.6435}, // Sweden
+	"no": {Lat: 60.4720, Lon: 8.4689},  // Norway
+	"dk": {Lat: 56.2639, Lon: 9.5018},  // Denmark
+	"fi": {Lat: 61.9241, Lon: 25.7482}, // Finland
+	"ie": {Lat: 53.1424, Lon: -7.6921}, // Ireland
+	"pt": {Lat: 39.3999, Lon: -8.2245}, // Portugal
+	"gr": {Lat: 39.0742, Lon: 21.8243}, // Greece
+	"hu": {Lat: 47.1625, Lon: 19.5033}, // Hungary
+	"ro": {Lat: 45.9432, Lon: 24.9668}, // Romania
+	"bg": {Lat: 42.7339, Lon: 25.4858}, // Bulgaria
+	"sk": {Lat: 48.6690, Lon: 19.6990}, // Slovakia
+	"hr": {Lat: 45.1000, Lon: 15.2000}, // Croatia
+	"si": {Lat: 46.1512, Lon: 14.9955}, // Slovenia
+	"lt": {Lat: 55.1694, Lon: 23.8813}, // Lithuania
+	"lv": {Lat: 56.8796, Lon: 24.6032}, // Latvia
+	"ee": {Lat: 58.5953, Lon: 25.0136}, // Estonia
+	"lu": {Lat: 49.8153, Lon: 6.1296},  // Luxembourg
+	"mt": {Lat: 35.9375, Lon: 14.3754}, // Malta
+	"cy": {Lat: 35.1264, Lon: 33.4299}, // Cyprus
+
+	// Eastern Europe / CIS
+	"ru": {Lat: 61.5240, Lon: 105.3188}, // Russia
+	"ua": {Lat: 48.3794, Lon: 31.1656},  // Ukraine
+	"by": {Lat: 53.7098, Lon: 27.9534},  // Belarus
+	"kz": {Lat: 48.0196, Lon: 66.9237},  // Kazakhstan
+	"md": {Lat: 47.4116, Lon: 28.3699},  // Moldova
+	"az": {Lat: 40.1431, Lon: 47.5769},  // Azerbaijan
+	"am": {Lat: 40.0691, Lon: 45.0382},  // Armenia
+	"ge": {Lat: 42.3154, Lon: 43.3569},  // Georgia
+	"uz": {Lat: 41.3775, Lon: 64.5853},  // Uzbekistan
+	"kg": {Lat: 41.2044, Lon: 74.7661},  // Kyrgyzstan
+	"tj": {Lat: 38.8610, Lon: 71.2761},  // Tajikistan
+	"tm": {Lat: 38.9697, Lon: 59.5563},  // Turkmenistan
+
+	// Asia
+	"jp": {Lat: 36.2048, Lon: 138.2529}, // Japan
+	"hk": {Lat: 22.3193, Lon: 114.1694}, // Hong Kong
+	"sg": {Lat: 1.3521, Lon: 103.8198},  // Singapore
+	"cn": {Lat: 35.8617, Lon: 104.1954}, // China
+	"kr": {Lat: 35.9078, Lon: 127.7669}, // South Korea
+	"tw": {Lat: 23.6978, Lon: 120.9605}, // Taiwan
+	"in": {Lat: 20.5937, Lon: 78.9629},  // India
+	"id": {Lat: -0.7893, Lon: 113.9213}, // Indonesia
+	"th": {Lat: 15.8700, Lon: 100.9925}, // Thailand
+	"vn": {Lat: 14.0583, Lon: 108.2772}, // Vietnam
+	"my": {Lat: 4.2105, Lon: 101.9758},  // Malaysia
+	"ph": {Lat: 12.8797, Lon: 121.7740}, // Philippines
+	"pk": {Lat: 30.3753, Lon: 69.3451},  // Pakistan
+	"bd": {Lat: 23.6850, Lon: 90.3563},  // Bangladesh
+	"lk": {Lat: 7.8731, Lon: 80.7718},   // Sri Lanka
+	"np": {Lat: 28.3949, Lon: 84.1240},  // Nepal
+	"mm": {Lat: 21.9162, Lon: 95.9560},  // Myanmar
+	"kh": {Lat: 12.5657, Lon: 104.9910}, // Cambodia
+	"la": {Lat: 19.8563, Lon: 102.4955}, // Laos
+	"mn": {Lat: 46.8625, Lon: 103.8467}, // Mongolia
+
+	// Middle East
+	"tr": {Lat: 38.9637, Lon: 35.2433}, // Turkey
+	"ir": {Lat: 32.4279, Lon: 53.6880}, // Iran
+	"sa": {Lat: 23.8859, Lon: 45.0792}, // Saudi Arabia
+	"ae": {Lat: 23.4241, Lon: 53.8478}, // UAE
+	"il": {Lat: 31.0461, Lon: 34.8516}, // Israel
+	"jo": {Lat: 30.5852, Lon: 36.2384}, // Jordan
+	"lb": {Lat: 33.8547, Lon: 35.8623}, // Lebanon
+	"iq": {Lat: 33.2232, Lon: 43.6793}, // Iraq
+	"sy": {Lat: 34.8021, Lon: 38.9968}, // Syria
+	"om": {Lat: 21.4735, Lon: 55.9754}, // Oman
+	"qa": {Lat: 25.3548, Lon: 51.1839}, // Qatar
+	"bh": {Lat: 25.9304, Lon: 50.6378}, // Bahrain
+	"kw": {Lat: 29.3117, Lon: 47.4818}, // Kuwait
+
+	// Oceania
+	"au": {Lat: -25.2744, Lon: 133.7751}, // Australia
+	"nz": {Lat: -40.9006, Lon: 174.8860}, // New Zealand
+
+	// South America
+	"br": {Lat: -14.2350, Lon: -51.9253}, // Brazil
+	"ar": {Lat: -38.4161, Lon: -63.6167}, // Argentina
+	"cl": {Lat: -35.6751, Lon: -71.5430}, // Chile
+	"co": {Lat: 4.5709, Lon: -74.2973},   // Colombia
+	"pe": {Lat: -9.1900, Lon: -75.0152},  // Peru
+	"ve": {Lat: 6.4238, Lon: -66.5897},   // Venezuela
+	"ec": {Lat: -1.8312, Lon: -78.1834},  // Ecuador
+	"bo": {Lat: -16.2902, Lon: -63.5887}, // Bolivia
+	"py": {Lat: -23.4425, Lon: -58.4438}, // Paraguay
+	"uy": {Lat: -32.5228, Lon: -55.7658}, // Uruguay
+	"gy": {Lat: 4.8604, Lon: -58.9302},   // Guyana
+	"sr": {Lat: 3.9193, Lon: -56.0278},   // Suriname
+
+	// Africa
+	"za": {Lat: -30.5595, Lon: 22.9375}, // South Africa
+	"eg": {Lat: 26.0975, Lon: 30.0444},  // Egypt
+	"ng": {Lat: 9.0820, Lon: 8.6753},    // Nigeria
+	"ke": {Lat: -0.0236, Lon: 37.9062},  // Kenya
+	"et": {Lat: 9.1450, Lon: 40.4897},   // Ethiopia
+	"tz": {Lat: -6.3690, Lon: 34.8888},  // Tanzania
+	"gh": {Lat: 7.9465, Lon: -1.0232},   // Ghana
+	"mz": {Lat: -18.6657, Lon: 35.5296}, // Mozambique
+	"mg": {Lat: -18.7669, Lon: 46.8691}, // Madagascar
+	"cm": {Lat: 7.3697, Lon: 12.3547},   // Cameroon
+	"ci": {Lat: 7.5400, Lon: -5.5471},   // Ivory Coast
+	"ne": {Lat: 17.6078, Lon: 8.0817},   // Niger
+	"sn": {Lat: 14.4974, Lon: -14.4524}, // Senegal
+	"ml": {Lat: 17.5707, Lon: -3.9962},  // Mali
+	"bf": {Lat: 12.2383, Lon: -1.5616},  // Burkina Faso
+	"rw": {Lat: -1.9403, Lon: 29.8739},  // Rwanda
+	"so": {Lat: 5.1521, Lon: 46.1996},   // Somalia
+	"ss": {Lat: 6.8770, Lon: 31.3070},   // South Sudan
+	"sd": {Lat: 12.8628, Lon: 30.2176},  // Sudan
+	"ug": {Lat: 1.3733, Lon: 32.2903},   // Uganda
+	"zm": {Lat: -13.1339, Lon: 27.8493}, // Zambia
+	"zw": {Lat: -19.0154, Lon: 29.1549}, // Zimbabwe
+	"bw": {Lat: -22.3285, Lon: 24.6849}, // Botswana
+	"na": {Lat: -22.9576, Lon: 18.4904}, // Namibia
+	"ao": {Lat: -11.2027, Lon: 17.8739}, // Angola
+	"cd": {Lat: -4.0383, Lon: 21.7587},  // DR Congo
+	"cg": {Lat: -0.2280, Lon: 15.8277},  // Congo
+	"ga": {Lat: -0.8037, Lon: 11.6094},  // Gabon
+	"gq": {Lat: 1.6508, Lon: 10.2679},   // Equatorial Guinea
+	"st": {Lat: 0.1864, Lon: 6.6131},    // Sao Tome and Principe
+	"bi": {Lat: -3.3731, Lon: 29.9189},  // Burundi
+	"dj": {Lat: 11.8251, Lon: 42.5903},  // Djibouti
+	"er": {Lat: 15.1794, Lon: 39.7823},  // Eritrea
+	"ls": {Lat: -29.6100, Lon: 28.2336}, // Lesotho
+	"sz": {Lat: -26.5225, Lon: 31.4659}, // Eswatini
+	"mu": {Lat: -20.3484, Lon: 57.5522}, // Mauritius
+	"km": {Lat: -11.8750, Lon: 43.8722}, // Comoros
+	"sc": {Lat: -4.6796, Lon: 55.4920},  // Seychelles
+	"cv": {Lat: 16.5388, Lon: -23.0418}, // Cape Verde
+
+	// Central America & Caribbean
+	"gt": {Lat: 15.7835, Lon: -90.2308}, // Guatemala
+	"hn": {Lat: 15.2000, Lon: -86.2419}, // Honduras
+	"sv": {Lat: 13.7942, Lon: -88.8965}, // El Salvador
+	"ni": {Lat: 12.8654, Lon: -85.2072}, // Nicaragua
+	"cr": {Lat: 9.7489, Lon: -83.7534},  // Costa Rica
+	"pa": {Lat: 8.5380, Lon: -80.7821},  // Panama
+	"cu": {Lat: 21.5218, Lon: -77.7812}, // Cuba
+	"jm": {Lat: 18.1096, Lon: -77.2975}, // Jamaica
+	"ht": {Lat: 18.9712, Lon: -72.2852}, // Haiti
+	"do": {Lat: 18.7357, Lon: -70.1627}, // Dominican Republic
+	"tt": {Lat: 10.6918, Lon: -61.2225}, // Trinidad and Tobago
+	"bb": {Lat: 13.1939, Lon: -59.5432}, // Barbados
+	"bs": {Lat: 25.0343, Lon: -77.3963}, // Bahamas
+	"bz": {Lat: 17.1899, Lon: -88.4976}, // Belize
 }
 
 // isRoutingRestricted checks political routing restrictions