refactor(actions): standardize action tools, add integration tests (step5)

[stex2005]

Summary

Step 5 of 7 — targets feature/step4 (#316)

• Migrate 21 hardcoded /rosapi/ strings in actions.py to rosapi_service()/rosapi_type()
• Refactor action tools to match nodes/topics/services pattern (_check_response/_safe_get_values)
• Remove redundant service-availability pre-flights, hardcoded action_type_map, triplicated typedef parsing
• Add turtle_actionlib to ROS 1 Docker images for action server testing
• Integration tests for get_actions, get_action_details, get_action_status across all distros

Changes

• ros_mcp/tools/actions.py — refactor + migrate (+188 -477):
  • Extract _parse_typedef() and _fetch_action_part() helpers
  • get_actions: use _check_response/_safe_get_values directly
  • get_action_details: require explicit action_type, return available types when missing
  • send_action_goal: remove asyncio.sleep that caused missed results
  • Remove unused asyncio import
• tests/integration/test_actions.py — 7 tests:
  • get_actions: returns actions, includes expected action (distro-aware)
  • get_action_details: structure on ROS 2, empty/nonexistent errors
  • get_action_status: status on ROS 2, empty error
• Dockerfile.ros1-melodic/noetic — add turtle-actionlib package
• ros1_launch.launch — add /turtle_shape action server node

Testing

68 tests pass on humble/jazzy, 66 pass + 2 skipped on melodic/noetic. Skips: action detail inspection and status require ROS 2 rosbridge features (see #320).

Related issues

• refactor: remove hardcoded action_type_map in actions.py #317 — Remove hardcoded action_type_map (done in this PR)
• bug: send_action_goal times out even when action succeeds #318 — send_action_goal timeout bug (websocket manager, out of scope)
• feat: implement ROS 1 actionlib support via 5-topic pattern #320 — ROS 1 actionlib support via 5-topic pattern (future)

PR stack

Step	PR	Status
Step 0: detection + Docker infra	#276	merged
Step 1: connection + robot config	#278	merged
Step 2: nodes	#280	open
Step 3: topics	#281	open
Step 4: services	#316	merged
Step 5: actions	this PR	open
Step 6: parameters	(not created)	—
Step 7: resources	(not created)	—