ci: add comprehensive GitHub Actions workflows for testing and automation #9

Job	Run time
Check Template Size	3s
Validate Pull Request	5s
Test Feature Combinations (celery)	17s
Test Feature Combinations (basic)	15s
Test Feature Combinations (none)	18s
Test Feature Combinations (advanced)	11s
Test Feature Combinations (drf, none)	17s
Test Feature Combinations (temporal)	17s
Test Feature Combinations (both)	14s
Test Feature Combinations (both, none)	15s
Test Feature Combinations (graphql-strawberry, none)	16s
Test Feature Combinations (none, htmx-tailwind)	13s
	2m 41s

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