docs: complete Daytona backend documentation coverage

Update all remaining files that enumerate terminal backends to include
Daytona. Covers security docs (bypass info, backend comparison table),
environment variables reference (DAYTONA_API_KEY, TERMINAL_DAYTONA_IMAGE,
container resources header), AGENTS.md (architecture tree, config keys),
environments/README.md, hermes_base_env.py field description, and various
module docstrings.

Follow-up to PR #451 merge.

hermes_cli/setup.py

@@ -394,7 +394,7 @@ def _print_setup_summary(config: dict, hermes_home):
 
 
 def _prompt_container_resources(config: dict):
-    """Prompt for container resource settings (Docker, Singularity, Modal)."""
+    """Prompt for container resource settings (Docker, Singularity, Modal, Daytona)."""
     terminal = config.setdefault('terminal', {})
 
     print()