Fix dev server healthcheck and distribution issues

[renardeinside]

Summary

• Add --skip-healthcheck flag to dev start and dev restart commands for faster startup when health verification isn't needed
• Fix HTTP health probe to accept any HTTP response (including 5xx) as healthy — only connection failures indicate the server isn't ready
• Remove hooks from skill distribution (no longer bundled via install_skills_to)
• Fix docs formatting and table alignment

Test plan

• Run apx dev start --skip-healthcheck and verify server starts without waiting for health probe
• Run apx dev restart --skip-healthcheck and verify restart skips healthcheck
• Run apx dev start (without flag) and verify normal healthcheck still works
• Verify MCP tools still pass false for skip_healthcheck by default
• Run just check and confirm all lints pass

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