Add Apple Silicon (ARM64) Traefik workaround to DEV-INTRO.md

[clarissecheung]

Description

• Added a note to DEV-INTRO.md documenting a Traefik workaround for Apple Silicon (M1/M2/M3/M4) Macs
• Updated CHANGELOG.md

Motivation and Context

When running PEcAn's Docker stack on Apple Silicon Macs, the default Traefik image (traefik:v2.9) is built only for linux/amd64 and cannot reliably communicate with the Docker socket when running under emulation on ARM64. This causes all web routes to return 404 errors. Using traefik:v2.11 with platform: linux/arm64 resolves the issue.

Closes #3910

Review Time Estimate

• Immediately
• Within one week
• When possible

Types of changes

• Documentation update

Checklist:

• My change requires a change to the documentation.
• My name is in the list of CITATION.cff
• I agree that PEcAn Project may distribute my contribution under any or all of
  • the same license as the existing code,
  • and/or the BSD 3-clause license.
• I have updated the CHANGELOG.md.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.