chore(security): enhance environment configuration, CI workflows, and wallet daemon with security improvements

- Restructure .env.example with security-focused documentation, service-specific environment file references, and AWS Secrets Manager integration
- Update CLI tests workflow to single Python 3.13 version, add pytest-mock dependency, and consolidate test execution with coverage
- Add comprehensive security validation to package publishing workflow with manual approval gates, secret scanning, and release

cli/aitbc_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"
+]