Add 1-month cooldown to all Dependabot update configurations

[Copilot]

Dependabot was configured to create PRs immediately after new versions were published. Adding a 30-day cooldown across all ecosystems reduces churn from short-lived or unstable releases.

Changes

• Added cooldown: default-days: 30 to all five package ecosystems in .github/dependabot.yml:
  • uv (backend)
  • npm (frontend, docs)
  • github-actions
  • docker
  • docker-compose

- package-ecosystem: "uv"
  directory: "/backend"
  schedule:
    interval: "weekly"
  cooldown:
    default-days: 30

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[cloudflare-workers-and-pages]

Deploying bracket-frontend with    Cloudflare Pages

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.75%. Comparing base (92d0648) to head (c7a3b47).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1656   +/-   ##
=======================================
  Coverage   94.74%   94.75%           
=======================================
  Files         120      120           
  Lines        4379     4381    +2     
=======================================
+ Hits         4149     4151    +2     
  Misses        230      230           

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