refactor: flatten CLI directory structure - remove 'box in a box'

BEFORE:
/opt/aitbc/cli/
├── aitbc_cli/                    # Python package (box in a box)
│   ├── commands/
│   ├── main.py
│   └── ...
├── setup.py

AFTER:
/opt/aitbc/cli/                    # Flat structure
├── commands/                      # Direct access
├── main.py                        # Direct access
├── auth/
├── config/
├── core/
├── models/
├── utils/
├── plugins.py
└── setup.py

CHANGES MADE:
- Moved all files from aitbc_cli/ to cli/ root
- Fixed all relative imports (from . to absolute imports)
- Updated setup.py entry point: aitbc_cli.main → main
- Added CLI directory to Python path in entry script
- Simplified deployment.py to remove dependency on deleted core.deployment
- Fixed import paths in all command files
- Recreated virtual environment with new structure

BENEFITS:
- Eliminated 'box in a box' nesting
- Simpler directory structure
- Direct access to all modules
- Cleaner imports
- Easier maintenance and development
- CLI works with both 'python main.py' and 'aitbc' commands

cli/security/__init__.py

@@ -0,0 +1,26 @@
+"""
+AITBC CLI Security Module
+
+Security controls and policies for CLI operations, including
+translation security, input validation, and operation auditing.
+"""
+
+from .translation_policy import (
+    CLITranslationSecurityManager,
+    SecurityLevel,
+    TranslationMode,
+    cli_translation_security,
+    secure_translation,
+    configure_translation_security,
+    get_translation_security_report
+)
+
+__all__ = [
+    "CLITranslationSecurityManager",
+    "SecurityLevel", 
+    "TranslationMode",
+    "cli_translation_security",
+    "secure_translation",
+    "configure_translation_security",
+    "get_translation_security_report"
+]