Fix SQL syntax error in ConditionOccurrenceRecorder duplicate detection

[Copilot]

Addresses feedback on PR #279 regarding malformed SQL in the condition occurrence duplicate detection logic.

Changes

• Fixed SQL syntax error in ConditionOccurrenceRecorder.cs lines 125 and 134
• Changed or and to or in both WHERE clauses that check for duplicate records

-- Before (invalid SQL)
and (co.condition_concept_id != 0 or and co.condition_source_value = r.condition_source_value)

-- After
and (co.condition_concept_id != 0 or co.condition_source_value = r.condition_source_value)

The duplicate detection now correctly checks if either the condition_concept_id is non-zero OR the source values match, when determining whether a condition occurrence already exists.

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