Fix tools/call routing and dependency injection for MSA architecture

test_call.py

@@ -0,0 +1,27 @@
+import urllib.request
+import json
+
+payload = {
+  "jsonrpc": "2.0",
+  "method": "tools/call",
+  "params": {
+    "name": "grade",
+    "arguments": { "cust_id": "C001" }
+  },
+  "id": 1
+}
+
+url = 'http://localhost:8081/mcp/api/v1/tools/call'
+headers = {
+    'Content-Type': 'application/json',
+    'X-API-KEY': 'SHINHAN_MCP_TEST_KEY_9999'
+}
+
+data = json.dumps(payload).encode('utf-8')
+req = urllib.request.Request(url, data=data, headers=headers, method='POST')
+
+try:
+    with urllib.request.urlopen(req) as response:
+        print(f"Response: {response.read().decode('utf-8')}")
+except Exception as e:
+    print(f"Error: {e}")