feat: migrate coordinator-api routers and exchange_island CLI to use centralized aitbc package HTTP client

- Replace httpx.Client with aitbc.AITBCHTTPClient in client.py get_blocks endpoint
- Migrate monitoring_dashboard.py from httpx.AsyncClient to AITBCHTTPClient
- Replace httpx with AITBCHTTPClient in blockchain.py get_balance function
- Add NetworkError exception handling across all migrated endpoints
- Remove async context managers in favor of direct AITBCHTTPClient usage
- Remove httpx imports

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

@@ -226,22 +226,27 @@ async def get_blocks(
 ) -> dict:  # type: ignore[arg-type]
     """Get recent blockchain blocks"""
     try:
-        import httpx
-
         # Query the local blockchain node for blocks
-        with httpx.Client() as client:
-            response = client.get(
-                "http://10.1.223.93:8082/rpc/blocks-range", params={"start": offset, "end": offset + limit}, timeout=5
+        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}
             )
-
-            if response.status_code == 200:
-                blocks_data = response.json()
-                return {
-                    "blocks": blocks_data.get("blocks", []),
-                    "total": blocks_data.get("total", 0),
-                    "limit": limit,
-                    "offset": offset,
-                }
+            return {
+                "blocks": blocks_data.get("blocks", []),
+                "total": blocks_data.get("total", 0),
+                "limit": limit,
+                "offset": offset,
+            }
+        except NetworkError as e:
+            logger.error(f"Failed to fetch blocks: {e}")
+            return {
+                "blocks": [],
+                "total": 0,
+                "limit": limit,
+                "offset": offset,
+                "error": "Failed to fetch blocks",
+            }
             else:
                 # Fallback to empty response if blockchain node is unavailable
                 return {

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

@@ -191,24 +191,25 @@ async def collect_all_health_data() -> dict[str, Any]:
     """Collect health data from all enhanced services"""
     health_data = {}
 
-    async with httpx.AsyncClient(timeout=5.0) as client:
-        tasks = []
+    client = AITBCHTTPClient(timeout=5.0)
+    tasks = []
 
-        for service_id, service_info in SERVICES.items():
-            task = check_service_health(client, service_id, service_info)
-            tasks.append(task)
+    for service_id, service_info in SERVICES.items():
+        task = check_service_health(client, service_id, service_info)
+        tasks.append(task)
 
-        results = await asyncio.gather(*tasks, return_exceptions=True)
+    results = await asyncio.gather(*tasks, return_exceptions=True)
 
-        for i, (service_id, service_info) in enumerate(SERVICES.items()):
-            result = results[i]
-            if isinstance(result, Exception):
-                health_data[service_id] = {
-                    "status": "unhealthy",
-                    "error": str(result),
-                    "timestamp": datetime.utcnow().isoformat(),
-                }
-            else:
+    for i, (service_id, service_info) in enumerate(SERVICES.items()):
+        result = results[i]
+        if isinstance(result, Exception):
+            health_data[service_id] = {
+                "status": "unhealthy",
+                "error": str(result),
+                "timestamp": datetime.utcnow().isoformat(),
+            }
+        else:
+            health_data[service_id] = result
 
     return health_data