docs: update .env.example with all variables for the new docker-compose

Author: Cadenadb

.env.example

@@ -1,28 +1,30 @@
 # ============================================================
 # RTMPayServer — Environment Configuration
-# Copy this file: cp .env.example .env
-# Then edit with your values before running docker compose up
+# Copy this file to .env and fill in your values
+#   cp .env.example .env
 # ============================================================
 
-# ── Raptoreum Node RPC ─────────────────────────────────────
-RTM_RPC_USER=rtmrpc
-RTM_RPC_PASSWORD=change_me_strong_password_1
-RTM_P2P_PORT=10226
+# ── Network ─────────────────────────────────────────────────
+# mainnet | testnet | regtest
+BITCOIN_NETWORK=mainnet
 
-# ── Bitcoin Node RPC ───────────────────────────────────────
-BTC_RPC_USER=btcrpc
-BTC_RPC_PASSWORD=change_me_strong_password_2
-BTC_NETWORK=mainnet
-# Options: mainnet | testnet | regtest
+# ── BTCPayServer ─────────────────────────────────────────────
+# Your domain or IP, e.g.: pay.yourdomain.com or 1.2.3.4:23001
+BTCPAY_HOST=pay.yourdomain.com
+BTCPAY_PORT=23001
 
-# ── PostgreSQL ─────────────────────────────────────────────
-POSTGRES_USER=btcpay
-POSTGRES_PASSWORD=change_me_strong_password_3
+# ── PostgreSQL ───────────────────────────────────────────────
+POSTGRES_PASSWORD=change_me_strong_password
 
-# ── BTCPayServer ───────────────────────────────────────────
-# Your domain or IP address (no http://, no trailing slash)
-BTCPAY_HOST=your-domain.com
-BTCPAY_PORT=23000
+# ── Bitcoin Core RPC ─────────────────────────────────────────
+BTC_RPC_USER=btcrpc
+BTC_RPC_PASSWORD=change_me_strong_password
+# RPC port: mainnet=8332, testnet=18332, regtest=18443
+BTC_RPC_PORT=8332
+# P2P port: mainnet=8333, testnet=18333, regtest=18444
+BTC_P2P_PORT=8333
 
-# ── Lightning Network (optional) ───────────────────────────
-LIGHTNING_ALIAS=MyRTMPayNode
+# ── Raptoreum (RTM) — optional ───────────────────────────────
+# Uncomment and fill in if you enable the raptoreumd service
+# RTM_RPC_USER=rtmrpc
+# RTM_RPC_PASSWORD=change_me_strong_password