Prevent infinite recursion in filter match with depth limit

[Copilot]

The match function in TxtaiStore._matches_filters recursively processes nested collections but lacked depth protection, risking stack overflow with deeply nested or circular structures.

Changes:

• Added depth parameter to match function with _FILTER_MATCH_MAX_DEPTH = 10 class constant
• Returns False with warning log when depth limit exceeded
• Recursive collection traversal now increments depth counter

def match(have: Any, cond: Any, depth: int = 0) -> bool:
    if depth >= TxtaiStore._FILTER_MATCH_MAX_DEPTH:
        log.warning(f"Filter match depth limit ({TxtaiStore._FILTER_MATCH_MAX_DEPTH}) exceeded")
        return False
    
    if isinstance(have, (list, tuple, set)):
        return any(match(item, cond, depth + 1) for item in have)
    # ... rest of matching logic

Normal filter operations unaffected; only prevents pathological cases beyond 10 nesting levels.

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