docs: add project configuration document for E-commerce Platform

[huyguain]

Description

Brief summary of what this PR does.

Type of Change

• New example or template
• Documentation improvement
• Bug fix
• Feature guide
• Other (please describe)

Related Issues

Closes #(issue number)

Changes Made

• Change 1
• Change 2
• Change 3

What to Review

What should reviewers focus on?

Files Changed

• path/to/file1.md
• path/to/file2.md

Testing

How have you tested this?

• Tested locally with Claude Code
• Verified examples work
• Checked links and references
• Reviewed for typos and clarity

Checklist

• Follows project structure and conventions
• Includes clear documentation/examples
• Code/examples are copy-paste ready
• All links are verified and working
• No sensitive information included (keys, tokens, credentials)
• Updated relevant README files
• Commit message follows conventional commit format
• No large files (>1MB) added

Screenshots or Examples

If applicable, show what this adds:

[Example code or before/after comparison]

Breaking Changes

Does this change any existing content or behavior?

• No breaking changes
• Yes, and it's documented below

If yes, please describe:

Additional Notes

Any other information for reviewers?