Improve CLI: support --palace argument after subcommands for consistent usage

[iron-prog]

Problem

The --palace argument only works when provided before the subcommand:
mempalace –palace ./p1 mine project
However, passing it after the subcommand (which is more intuitive) results in an error:

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Solution

• Added --palace argument support to relevant subcommands:

  • init
  • mine
  • search
  • compress
  • wake-up
  • status
  • migrate

• Introduced a helper resolve_palace() to centralize palace path resolution

• Updated command handlers to use the helper for consistency

• Used environment override (MEMPALACE_PALACE) in init to respect custom palace path

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Why this matters

This aligns MemPalace CLI behavior with common CLI tools (e.g., git, docker, kubectl), making it more intuitive and user-friendly.

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• Verified both usage styles work:

Checklist

• Tests pass (python -m pytest tests/ -v)
• No hardcoded paths
• Linter passes (ruff check .)

[iron-prog]

Any update on this