chore: wrap get exercise actions in api route

[lucasnevespereira]

📝 Description

This PR introduces the following improvements:

• Health Check Route: Adds a dedicated /api/health endpoint to verify API availability and service health.
• Exercises API Route: Wraps the getExercises action within a new API route.

---

✅ Testing

1. Valid Request — Exercises Found

Request:

http POST http://localhost:3000/api/exercises
muscles:='["CHEST", "FULL_BODY", "GLUTES"]'
equipment:='["BODYWEIGHT", "BARBELL", "BENCH"]'
limit:=5

Response:

• Status: 200 OK
• Body: Returns a list of matching exercises.

---

2. Invalid Input — Enum Validation

Request:

http POST http://localhost:3000/api/exercises
muscles:='["TOTO"]'
equipment:='["BODYWEIGHT", "BARBELL", "BENCH"]'
limit:=5

Response:

• Status: 400 Bad Request
• Body: Provides detailed validation errors, including the invalid enum value.

---

3. No Exercises Found

Request:

http POST http://localhost:3000/api/exercises
muscles:='["ADDUCTORS"]'
equipment:='["CROSSFIT"]'
limit:=5

Response:

• Status: 404 Not Found
• Body: Returns an error message indicating no exercises were found.

---

ℹ️ Notes

• All scenarios above were tested locally and are working as expected.
• The new health check route can be used for uptime monitoring and deployment readiness checks.

[vercel]

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