fix(deps): don't suggest apt/install-deps on non-Debian Linux

[alpham8]

Summary

• On non-Debian distributions Playwright gave guidance that cannot work there:
  the host-dependency warning printed Debian package names
  (sudo apt-get install libicu74 …) and the MCP browser-launch error suggested
  npx playwright install-deps, which only supports Debian/Ubuntu.
• Added a shared isDebianBasedDistro() helper in @utils/linuxUtils that reads
  ID / ID_LIKE from /etc/os-release.
• Dependency validation and the MCP missing-dependency hint now only suggest
  apt / install-deps on Debian/Ubuntu. On other distributions they name the
  detected distribution and point to its native package manager (zypper, dnf or
  pacman).
• install-deps itself now exits with a clear message on non-Debian distributions
  instead of attempting an apt install.

Notes

• The misleading hints appeared because hostPlatform falls back to
  ubuntu24.04-x64 for unknown distros so the browser binaries still download —
  the new helper reads the real /etc/os-release, independent of that fallback.

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