ci: add update-badges workflow with dispatch trigger

- Runs on push to main when Python files change
- Can be manually triggered via workflow_dispatch
- Executes pylint and pyright to extract quality scores
- Updates README.md badges with current metrics
- Auto-commits changes with [skip ci] to prevent loops

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

.gitea/workflows/update-badges.yml

@@ -8,6 +8,7 @@ on:
       - '**.py'
       - '.pylintrc'
       - 'pyrightconfig.json'
+  workflow_dispatch:
 
 jobs:
   update-badges: