feat: add typed ESI transport extensions

tests/fixtures/esi/asset-locations-finite.json

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+[{"item_id":9007199254740993,"position":{"x":1,"y":-2,"z":0}}]

tests/fixtures/esi/asset-names-int64.json

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+[{"item_id":9007199254740993,"name":"Freighter"}]

tests/fixtures/esi/transport-metadata.json

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+{
+  "compatibilityDate": "2026-08-18",
+  "evidence": {
+    "assetHelpers": { "source": "docs/research/eve-openapi-evidence.json", "verification": "pinned-authoritative" },
+    "walletBalance": {
+      "source": "https://esi.evetech.net/meta/openapi.json?compatibility_date=2026-08-18",
+      "verification": "current-retrieval-with-pinned-compatibility-date-not-historical-capture",
+      "retrievedAt": "2026-09-19T19:30:12Z",
+      "responseDate": "2026-08-18",
+      "openapiVersion": "2026-08-18",
+      "sha256": "9a9a0f4af77216300e960cfd2576c9baac085a8170022e40c928c28622d80fc6",
+      "operationId": "GetCharactersCharacterIdWallet",
+      "route": "/characters/{character_id}/wallet",
+      "method": "GET",
+      "requiredScope": "esi-wallet.read_character_wallet.v1",
+      "characterId": { "type": "int64", "required": true },
+      "pagination": "none",
+      "response": { "status": 200, "mediaType": "application/json", "shape": "scalar number/double" },
+      "cache": { "ttlSeconds": 120, "policy": "ttl-based", "validators": ["Cache-Control", "ETag", "Last-Modified"] },
+      "rateLimit": { "group": "char-wallet", "tokens": 150, "window": "15m" },
+      "officialDocs": {
+        "versioning": "https://developers.eveonline.com/docs/services/esi/overview/",
+        "caching": "https://developers.eveonline.com/docs/services/esi/overview/#caching",
+        "rateLimiting": "https://developers.eveonline.com/docs/services/esi/rate-limiting/"
+      }
+    }
+  },
+  "operations": {
+    "characterAssetNames": { "route": "/characters/{character_id}/assets/names", "method": "POST", "requiredScope": "esi-assets.read_assets.v1" },
+    "characterAssetLocations": { "route": "/characters/{character_id}/assets/locations", "method": "POST", "requiredScope": "esi-assets.read_assets.v1" },
+    "characterWalletBalance": { "route": "/characters/{character_id}/wallet", "method": "GET", "requiredScope": "esi-wallet.read_character_wallet.v1" }
+  }
+}

tests/fixtures/esi/wallet-balance-signed.json

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+-9007199254740993.01