fix: resolve 'box in a box' nesting issues in codebase

ISSUES RESOLVED:
1. Coordinator API unnecessary nesting
   BEFORE: /apps/coordinator-api/aitbc/api/v1/settlement.py
   AFTER:  /apps/coordinator-api/src/app/routers/settlement.py

   - Moved settlement code to proper router location
   - Moved logging.py to main app directory
   - Integrated settlement functionality into main FastAPI app
   - Removed duplicate /aitbc/ directory

2. AITBC Core package structure
   ANALYZED: /packages/py/aitbc-core/src/aitbc/
   STATUS:   ✅ Kept as-is (proper Python packaging)

   - src/aitbc/ is standard Python package structure
   - No unnecessary nesting detected
   - Follows Poetry best practices

LEGITIMATE DIRECTORIES (NO CHANGES):
- /cli/debian/etc/aitbc (Debian package structure)
- /cli/debian/usr/share/aitbc (Debian package structure)
- Node modules and virtual environments

BENEFITS:
- Eliminated duplicate code locations
- Integrated settlement functionality into main app
- Cleaner coordinator-api structure
- Reduced confusion in codebase organization
- Maintained proper Python packaging standards

VERIFICATION:
✅ No more problematic 'aitbc' directories
✅ All code properly organized
✅ Standard package structures maintained
✅ No functionality lost in refactoring

apps/coordinator-api/src/app/logging.py

@@ -1,3 +1,31 @@
-from aitbc.logging import get_logger, setup_logger
+"""
+Logging utilities for AITBC coordinator API
+"""
 
-__all__ = ["get_logger", "setup_logger"]
+import logging
+import sys
+from typing import Optional
+
+def setup_logger(
+    name: str,
+    level: str = "INFO",
+    format_string: Optional[str] = None
+) -> logging.Logger:
+    """Setup a logger with consistent formatting"""
+    if format_string is None:
+        format_string = "%(asctime)s - %(name)s - %(levelname)s - %(message)s"
+    
+    logger = logging.getLogger(name)
+    logger.setLevel(getattr(logging, level.upper()))
+    
+    if not logger.handlers:
+        handler = logging.StreamHandler(sys.stdout)
+        formatter = logging.Formatter(format_string)
+        handler.setFormatter(formatter)
+        logger.addHandler(handler)
+    
+    return logger
+
+def get_logger(name: str) -> logging.Logger:
+    """Get a logger instance"""
+    return logging.getLogger(name)