chore: standardize configuration, logging, and error handling across blockchain node and coordinator API

- Add infrastructure.md and workflow files to .gitignore to prevent sensitive info leaks
- Change blockchain node mempool backend default from memory to database for persistence
- Refactor blockchain node logger with StructuredLogFormatter and AuditLogger (consistent with coordinator)
- Add structured logging fields: service, module, function, line number
- Unify coordinator config with Database

scripts/generate_openapi.py

@@ -0,0 +1,99 @@
+#!/usr/bin/env python3
+"""
+Generate OpenAPI specifications from FastAPI services
+"""
+
+import json
+import sys
+import subprocess
+import requests
+from pathlib import Path
+
+def extract_openapi_spec(service_name: str, base_url: str, output_file: str):
+    """Extract OpenAPI spec from a running FastAPI service"""
+    try:
+        # Get OpenAPI spec from the service
+        response = requests.get(f"{base_url}/openapi.json")
+        response.raise_for_status()
+        
+        spec = response.json()
+        
+        # Add service-specific metadata
+        spec["info"]["title"] = f"AITBC {service_name} API"
+        spec["info"]["description"] = f"OpenAPI specification for AITBC {service_name} service"
+        spec["info"]["version"] = "1.0.0"
+        
+        # Add servers configuration
+        spec["servers"] = [
+            {
+                "url": "https://aitbc.bubuit.net/api",
+                "description": "Production server"
+            },
+            {
+                "url": "https://staging-api.aitbc.io",
+                "description": "Staging server"
+            },
+            {
+                "url": "http://localhost:8011",
+                "description": "Development server"
+            }
+        ]
+        
+        # Save the spec
+        output_path = Path(output_file)
+        output_path.parent.mkdir(parents=True, exist_ok=True)
+        
+        with open(output_path, 'w') as f:
+            json.dump(spec, f, indent=2)
+        
+        print(f"✓ Generated {service_name} OpenAPI spec: {output_file}")
+        return True
+        
+    except Exception as e:
+        print(f"✗ Failed to generate {service_name} spec: {e}")
+        return False
+
+def main():
+    """Generate OpenAPI specs for all AITBC services"""
+    services = [
+        {
+            "name": "Coordinator API",
+            "base_url": "http://127.0.0.2:8011",
+            "output": "api/coordinator/openapi.json"
+        },
+        {
+            "name": "Blockchain Node API",
+            "base_url": "http://127.0.0.2:8080",
+            "output": "api/blockchain/openapi.json"
+        },
+        {
+            "name": "Wallet Daemon API",
+            "base_url": "http://127.0.0.2:8071",
+            "output": "api/wallet/openapi.json"
+        }
+    ]
+    
+    print("Generating OpenAPI specifications...")
+    
+    all_success = True
+    for service in services:
+        success = extract_openapi_spec(
+            service["name"],
+            service["base_url"],
+            service["output"]
+        )
+        if not success:
+            all_success = False
+    
+    if all_success:
+        print("\n✓ All OpenAPI specifications generated successfully!")
+        print("\nNext steps:")
+        print("1. Review the generated specs")
+        print("2. Commit them to the documentation repository")
+        print("3. Update the API reference documentation")
+    else:
+        print("\n✗ Some specifications failed to generate")
+        sys.exit(1)
+
+if __name__ == "__main__":
+    main()