Replace hardcoded IPs with environment variables

Fixed hardcoded IP addresses in production code by replacing them with
environment variables or config settings:

- apps/blockchain-node/src/aitbc_chain/sync_cli.py: Use AITBC_SYNC_SOURCE
  and AITBC_SYNC_IMPORT_URL env vars for RPC URLs
- apps/blockchain-node/src/aitbc_chain/app.py: Use AITBC_TRUSTED_IPS
  env var for rate limiting bypass
- apps/coordinator-api/src/app/routers/client.py: Use settings.blockchain_rpc_url
  for RPC endpoint
- dev/scripts/dev_heartbeat.py: Use AITBC_LOCAL_RPC and AITBC_GENESIS_RPC
  env vars for RPC URLs
- cli/aitbc_cli.py: Use AITBC_FOLLOWER_HOST and AITBC_FOLLOWER_PORT
  env vars for network peer display

This makes the codebase more portable and configurable for different
deployment environments.

apps/blockchain-node/src/aitbc_chain/app.py

@@ -35,7 +35,8 @@ class RateLimitMiddleware(BaseHTTPMiddleware):
     async def dispatch(self, request: Request, call_next):
         client_ip = request.client.host if request.client else "unknown"
         # Bypass rate limiting for localhost and internal network (sync/health internal traffic)
-        if client_ip in {"127.0.0.1", "::1", "10.1.223.93", "10.1.223.40"}:
+        trusted_ips = os.getenv("AITBC_TRUSTED_IPS", "127.0.0.1,::1").split(",")
+        if client_ip in trusted_ips:
             return await call_next(request)
         now = time.time()
         # Clean old entries

apps/blockchain-node/src/aitbc_chain/sync_cli.py

@@ -6,6 +6,7 @@ Usage: python -m aitbc_chain.sync_cli --source http://10.1.223.40:8006 [--batch-
 
 import argparse
 import asyncio
+import os
 import sys
 from pathlib import Path
 
@@ -19,8 +20,8 @@ from aitbc_chain.sync import ChainSync
 
 async def main() -> None:
     parser = argparse.ArgumentParser(description="Bulk import blocks from a leader to catch up quickly")
-    parser.add_argument("--source", default="http://10.1.223.40:8006", help="Source RPC URL")
-    parser.add_argument("--import-url", default="http://127.0.0.1:8006", help="Local RPC URL for import")
+    parser.add_argument("--source", default=os.getenv("AITBC_SYNC_SOURCE", "http://127.0.0.1:8006"), help="Source RPC URL")
+    parser.add_argument("--import-url", default=os.getenv("AITBC_SYNC_IMPORT_URL", "http://127.0.0.1:8006"), help="Local RPC URL for import")
     parser.add_argument("--batch-size", type=int, default=100, help="Blocks per batch")
     parser.add_argument("--poll-interval", type=float, default=0.2, help="Seconds between batches")
     args = parser.parse_args()

apps/coordinator-api/src/app/routers/client.py

@@ -230,7 +230,7 @@ async def get_blocks(
         client = AITBCHTTPClient(timeout=5.0)
         try:
             blocks_data = client.get(
-                "http://10.1.223.93:8082/rpc/blocks-range", params={"start": offset, "end": offset + limit}
+                f"{settings.blockchain_rpc_url}/rpc/blocks-range", params={"start": offset, "end": offset + limit}
             )
             return {
                 "blocks": blocks_data.get("blocks", []),

cli/aitbc_cli.py

@@ -2849,7 +2849,9 @@ def legacy_main():
         elif args.network_action == "peers":
             print("Network peers:")
             print("  - genesis (localhost:8006) - Connected")
-            print("  - aitbc1 (10.1.223.40:8007) - Connected")
+            follower_host = os.getenv("AITBC_FOLLOWER_HOST", "aitbc1")
+            follower_port = os.getenv("AITBC_FOLLOWER_PORT", "8007")
+            print(f"  - {follower_host} ({follower_host}:{follower_port}) - Connected")
         elif args.network_action == "sync":
             if args.status:
                 print("Network sync status:")

dev/scripts/dev_heartbeat.py

@@ -14,8 +14,8 @@ REPO_ROOT = Path("/opt/aitbc")
 LOGS_DIR = REPO_ROOT / "logs"
 
 # AITBC blockchain config
-LOCAL_RPC = "http://localhost:8006"
-GENESIS_RPC = "http://10.1.223.93:8006"
+LOCAL_RPC = os.getenv("AITBC_LOCAL_RPC", "http://localhost:8006")
+GENESIS_RPC = os.getenv("AITBC_GENESIS_RPC", "http://localhost:8006")
 MAX_HEIGHT_DIFF = 10  # acceptable block height difference between nodes
 
 def sh(cmd, cwd=REPO_ROOT):