Make host_id optional and improve tool parameter descriptions for LLMs

[amir20]

LLMs often pass host name instead of host ID, or omit host_id entirely.
This change:

• Makes host_id optional in all tools (fetch_container_logs, inspect,
  actions) since container IDs are unique across hosts
• Adds findContainerFlexible helper that resolves host names to IDs
  and searches across all hosts when host_id is omitted
• Improves parameter descriptions to clarify ID vs name distinction

https://claude.ai/code/session_01EoVbj5ecZzsZfroGiNALp3

[claude]

• Potential ambiguity: findContainerFlexible assumes container IDs are unique across hosts, but short/truncated IDs can collide. The first-match-wins logic at tools_helpers.go:89 could silently act on the wrong container.

• Extra lookup overhead: When hostID is provided but wrong, fallback calls ListAllContainers (all hosts) + another FindContainer. Consider logging a warning when the provided host_id fails, so users can diagnose stale/incorrect tool calls.

• Test gap: No test for fetch_container_logs or inspect_container without host_id, though the shared helper is covered via restart tests — acceptable.

• Minor: findContainerFlexible re-validates containerID == "" internally when callers already check this — redundant.

[claude]

Review: Make host_id optional and improve tool parameter descriptions

• findContainerFlexible (tools_helpers.go:67): redundant containerID == "" check — all callers already validate this before calling
• findContainerFlexible fall-through: when direct lookup fails with a provided hostID, the code silently falls back to a full ListAllContainers scan. Worth considering whether to surface the original error if the host was explicitly provided (LLM passed a wrong host ID vs. omitted it) — silent fallback may mask bugs
• Container ID uniqueness across hosts: comment says IDs are unique, but first-match-wins logic could silently pick the wrong container if IDs collide across hosts in edge cases; acceptable tradeoff but worth a comment
• Tests are solid — covers both missing and wrong host cases

Overall clean change with good tests. The redundant check is minor nit.