BA-048 — Add unique course slugs and stable public identifiers

[MaryammAli]

• Type: Enhancement
• Affected area: course entity/controller
• BackendAcademy
• Summary: Public lookup should not depend on mutable titles or opaque internal IDs alone.
• Acceptance criteria: Slugs are generated, normalized, unique, collision-safe, and covered by create/update tests.

[Archive-000]

@Archive-000 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

please can I WORK on this

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Congratulations, @Archive-000! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Third Campaign campaign!

@Archive-000's PR #721 was approved and merged by @Nabeelahh.

🏆 @Archive-000: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (156 total points). Track your full progress on GrantFox.

👏 Great work, @Archive-000! Keep contributing to BlockDash-Studios.

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This issue has been completed by @Archive-000 as part of the Stellar Wave Program's 8th Wave 🥳

😎 @Archive-000: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here. You can also Leave a review to share your experience working on this issue.

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