feat(cloudwatch-appsignals-mcp-server): add python flask sample app f…

[yiyuan-he]

Fixes

Summary

Adds Python Flask sample app for enablement evaluation.

Changes

• Simple Flask application (app.py) with:
  • Health check endpoint (/health)
  • S3 buckets listing endpoint (/api/buckets)
  • Environment-based configuration (PORT, SERVICE_NAME, AWS_REGION)
  • _Dockerfile for containerized deployment with Python 3.11
  • requirements.txt with Flask 3.0.0 and boto3 dependencies
  • start.sh - Startup script for local development
  • generate-traffic.sh - Traffic generator for testing

User experience

This sample app will be used as part of our evaluation framework to test Application Signals enablement with Python-Flask scenarios.

Checklist

If your change doesn't seem to apply, please leave them unchecked.

• [x] I have reviewed the contributing guidelines
• [x] I have performed a self-review of this change
• [x] Changes have been tested
• [x] Changes are documented

Is this a breaking change? (Y/N) N

RFC issue number:

Checklist:

• [ ] Migration process documented
• [ ] Implement warnings (if it can live side by side)

Acknowledgment

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of the project license.

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 89.92%. Comparing base (c9a8f82) to head (720ab5b).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1599      +/-   ##
==========================================
- Coverage   90.08%   89.92%   -0.17%     
==========================================
  Files         751      630     -121     
  Lines       54377    48048    -6329     
  Branches     8672     7788     -884     
==========================================
- Hits        48988    43206    -5782     
+ Misses       3454     3081     -373     
+ Partials     1935     1761     -174     

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