feat: align charon p2p relays with nodeopco — 4 obol relays, no third-party

LCDVN's CHARON_P2P_RELAYS were drifting from the production nodeopco
fleet config:

- docker-compose.yml default only had 0+1.relay.obol.tech (missing
  2.relay.obol.dev + 3.relay.obol.dev that were added recently)
- .env.sample.mainnet/hoodi listed 0+1.relay.obol.tech and two
  third-party relays (charon-relay.dsrvlabs.dev,
  relay-2.prod-relay.721.land) but no .obol.dev relays

Align everything with the canonical list used by Obol's own fleet
(`obol-infrastructure/nodeopco/ansible/playbooks/group_vars/all.yml`):

  https://0.relay.obol.tech
  https://1.relay.obol.tech
  https://2.relay.obol.dev
  https://3.relay.obol.dev

Dropped the third-party relays from .env.sample.* — operators who want
them can still add them manually, but they shouldn't be part of the
default Lido Simple DVT operator config.

Author: apham0001

.env.sample.hoodi

@@ -152,7 +152,7 @@ MEV_RELAYS=https://0x98f0ef62f00780cf8eb06701a7d22725b9437d4768bb19b363e882ae871
 #CHARON_VERSION=
 
 # Define custom relays. One or more ENRs or an http URL that return an ENR. Use a comma separated list excluding spaces.
-CHARON_P2P_RELAYS=https://0.relay.obol.tech,https://1.relay.obol.tech/,https://charon-relay.dsrvlabs.dev/,https://relay-2.prod-relay.721.land/
+CHARON_P2P_RELAYS=https://0.relay.obol.tech,https://1.relay.obol.tech/,https://2.relay.obol.dev/,https://3.relay.obol.dev/
 
 # Connect to one or more external beacon nodes. Use a comma separated list excluding spaces.
 CHARON_BEACON_NODE_ENDPOINTS=http://${CL}:5052

.env.sample.mainnet

@@ -152,7 +152,7 @@ MEV_RELAYS=https://0xa15b52576bcbf1072f4a011c0f99f9fb6c66f3e1ff321f11f461d15e31b
 #CHARON_VERSION=
 
 # Define custom relays. One or more ENRs or an http URL that return an ENR. Use a comma separated list excluding spaces.
-CHARON_P2P_RELAYS=https://0.relay.obol.tech,https://1.relay.obol.tech/,https://charon-relay.dsrvlabs.dev/,https://relay-2.prod-relay.721.land/
+CHARON_P2P_RELAYS=https://0.relay.obol.tech,https://1.relay.obol.tech/,https://2.relay.obol.dev/,https://3.relay.obol.dev/
 
 # Connect to one or more external beacon nodes. Use a comma separated list excluding spaces.
 CHARON_BEACON_NODE_ENDPOINTS=http://${CL}:5052

docker-compose.yml

@@ -95,7 +95,7 @@ services:
       - CHARON_FALLBACK_BEACON_NODE_ENDPOINTS=${CHARON_FALLBACK_BEACON_NODE_ENDPOINTS:-}
       - CHARON_LOG_LEVEL=${CHARON_LOG_LEVEL:-debug}
       - CHARON_LOG_FORMAT=${CHARON_LOG_FORMAT:-console}
-      - CHARON_P2P_RELAYS=${CHARON_P2P_RELAYS:-https://0.relay.obol.tech,https://1.relay.obol.tech/}
+      - CHARON_P2P_RELAYS=${CHARON_P2P_RELAYS:-https://0.relay.obol.tech,https://1.relay.obol.tech/,https://2.relay.obol.dev/,https://3.relay.obol.dev/}
       - CHARON_P2P_EXTERNAL_HOSTNAME=${CHARON_P2P_EXTERNAL_HOSTNAME:-} # Empty default required to avoid warnings.
       - CHARON_P2P_TCP_ADDRESS=0.0.0.0:${CHARON_PORT_P2P_TCP:-3610}
       - CHARON_VALIDATOR_API_ADDRESS=0.0.0.0:3600