Remove async from unregister_from_activity

[Copilot]

The unregister_from_activity endpoint was declared async def but performed only in-memory operations without any await statements, creating misleading async semantics.

Changes

• Changed unregister_from_activity from async def to def to match the pattern used by other in-memory endpoints (signup_for_activity, get_activities)

# Before
@app.post("/activities/{activity_name}/unregister")
async def unregister_from_activity(activity_name: str, email: str):
    # ... in-memory operations only ...

# After
@app.post("/activities/{activity_name}/unregister")
def unregister_from_activity(activity_name: str, email: str):
    # ... in-memory operations only ...

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