tac: add TAC mainnet archive profile with EVM JSON-RPC upstream

- Add archive profile (pruning=nothing) for tacchaind
- Change client_rpc_port from 26657 (CometBFT) to 8545 (EVM JSON-RPC)
- Update Dockerfile to download pre-built binary from GitHub releases v1.6.0
- Verify binary against checksums.txt
- Update init.sh to support PRUNING env var (nothing for archive, default for pruned)
- Update peers from NETWORKS.md
- Add archive snapshot URL note
- Traefik routes to EVM JSON-RPC port 8545 for both pruned and archive

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

compose_registry.json

@@ -9672,6 +9672,22 @@
       "starknet-sepolia-pathfinder-pruned"
     ]
   },
+  {
+    "chain": "mainnet",
+    "client": "tacchaind",
+    "compose_file": "tac/tacchaind/tac-mainnet-tacchaind-archive",
+    "drpc_chain": "tac",
+    "features": [],
+    "network": "tac",
+    "node": "config",
+    "relay": null,
+    "stack": null,
+    "type": "archive",
+    "volumes": [
+      "tac-mainnet-tacchaind-archive",
+      "tac-mainnet-tacchaind-archive_config"
+    ]
+  },
   {
     "chain": "mainnet",
     "client": "tacchaind",
@@ -9688,6 +9704,22 @@
       "tac-mainnet-tacchaind-pruned_config"
     ]
   },
+  {
+    "chain": "spb",
+    "client": "tacchaind",
+    "compose_file": "tac/tacchaind/tac-spb-tacchaind-archive",
+    "drpc_chain": "tac-spb",
+    "features": [],
+    "network": "tac",
+    "node": "config",
+    "relay": null,
+    "stack": null,
+    "type": "archive",
+    "volumes": [
+      "tac-spb-tacchaind-archive",
+      "tac-spb-tacchaind-archive_config"
+    ]
+  },
   {
     "chain": "spb",
     "client": "tacchaind",