🔒 Fix SQL execution for SQLite Vec Queue Database embeddings deletion

[ManupaKDU]

🎯 What: The issue reported an SQL injection in frigate/db/sqlitevecq.py via string concatenation in delete_embeddings_thumbnail. The existing code parameterized the values using ? properly to mitigate SQL injection. However, it was missing handling for empty lists, leading to potential syntax errors WHERE id IN (), and parameters weren't explicitly passed as a tuple.
⚠️ Risk: If an empty list of event_ids is passed, it results in a SQLite syntax error, potentially crashing the application or the background cleanup process. Although the original code parameterized correctly for non-empty lists, SAST tools often flag missing explicit bounds or tuple structures in such dynamic IN clauses as risks.
🛡️ Solution: Added a check to immediately return if the event_ids list is empty, preventing the generation of an invalid SQL statement. Also explicitly cast event_ids to a tuple in the execute_sql call to ensure the backend strictly interprets it as positional parameters instead of potentially malformed input types. The same fix was also correctly applied to the adjacent delete_embeddings_description function.

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PR created automatically by Jules for task 13088560508748280241 started by @manupawickramasinghe

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