Initial capay platform scaffold

infra/docker/btcpay/.env.example

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+BTCPAY_HOST=btc.capay.hao.work
+LETSENCRYPT_EMAIL=ops@capay.hao.work
+BTCPAYGEN_EXCLUDE_FRAGMENTS=nginx-https
+BTCPAYGEN_ADDITIONAL_FRAGMENTS=opt-save-storage,bitcoin
+BTCPAYGEN_LIGHTNING=lnd
+NBITCOIN_NETWORK=mainnet

infra/docker/keagate/local.json

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+{
+  "HOST": "https://doge.capay.hao.work",
+  "PORT": 8081,
+  "MONGO_CONNECTION_STRING": "mongodb://localhost:27017",
+  "MONGO_KEAGATE_DB": "keagate",
+
+  "IP_WHITELIST": ["127.0.0.1"],
+  "TRANSACTION_TIMEOUT": 1200000,
+  "TRANSACTION_MIN_REFRESH_TIME": 30000,
+  "TRANSACTION_SLIPPAGE_TOLERANCE": 0.02,
+
+  "SEED": "hex-128-bit-seed",
+  "KEAGATE_API_KEY": "replace-api-key",
+  "INVOICE_ENC_KEY": "hex-32-bytes",
+  "IPN_HMAC_SECRET": "replace-hmac-secret",
+
+  "DOGE": {
+    "ADMIN_PUBLIC_KEY": "DogePublicAddress",
+    "ADMIN_PRIVATE_KEY": null
+  },
+
+  "SOL": {
+    "ADMIN_PUBLIC_KEY": "SolPublicAddress",
+    "ADMIN_PRIVATE_KEY": null
+  }
+}