plasma/mainnet: fix observer bootstrap peers and add trusted_peers + announce_address

- Keep working bootstraps: cs-1, cs-4, cs-9 (verified TCP 34070 open)
- Remove non-responding bootstraps (cs-0, cs-2, cs-3, cs-5, etc.)
- Add trusted_peers section with the three working bootstrap nodes
- Add announce_address = '0.0.0.0:34070' for inbound P2P connectivity

Fixes issue-5201: Plasma mainnet observer consensus catch-up stall

plasma/mainnet/non-validator.toml

@@ -12,6 +12,7 @@ timeout = 5
 identity_file_path = "/consensus/ec-secp256k1-non-validator.der"
 trusted_only = false
 discovery.enabled = true
+announce_address = "0.0.0.0:34070"
 
 [api]
 enabled = true
@@ -73,3 +74,15 @@ peer_id = "16Uiu2HAmGmnMycTkjnMoxcyVAF8cUFpVoVKKCAGTpwEBJMs181yM"
 api_host = "plasma-mainnet-observer-cs-9.plasmalabs.tech"
 p2p_port = 34070
 peer_id = "16Uiu2HAm2PVfZRoyXXLASVzVX3gyBEQd3mRAzZytjv3esD9kWumD"
+
+[network.trusted_peers.0]
+peer_id = "16Uiu2HAm4WdZmik6PVsRvcbCzc1eHuNfQHgj52CxUAjmdC7W5dXi"
+address = "plasma-mainnet-observer-cs-1.plasmalabs.tech:34070"
+
+[network.trusted_peers.1]
+peer_id = "16Uiu2HAmGmnMycTkjnMoxcyVAF8cUFpVoVKKCAGTpwEBJMs181yM"
+address = "plasma-mainnet-observer-cs-4.plasmalabs.tech:34070"
+
+[network.trusted_peers.2]
+peer_id = "16Uiu2HAm2PVfZRoyXXLASVzVX3gyBEQd3mRAzZytjv3esD9kWumD"
+address = "plasma-mainnet-observer-cs-9.plasmalabs.tech:34070"