feat: implement course rating and review UI

[Anuoluwapo25]

Once the review API is built (#54), add the UI:\n\n- [ ] Star rating input on course completion page\n- [ ] Text review field (optional, max 500 chars)\n- [ ] Display aggregate rating (stars + count) on course card\n- [ ] Reviews section on course detail page\n- [ ] Pagination for reviews list\n- [ ] Own review shown first with edit button

[OsagieCynthia]

@OsagieCynthia has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hi 👋 am a full-stack developer
I will love to work on this issue please assign

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[Abidoyesimze]

@Abidoyesimze has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hi I'd like to work on this issue

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This issue has been completed by @Abidoyesimze as part of the Stellar Wave Program's 5th Wave 🥳

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