fix(flows): escape wildcard flow names when deduplicating

[suyua9]

Summary

• escape SQL LIKE wildcards when searching for existing numbered copies in _deduplicate_flow_name()
• keep exact numbered-suffix matching with the existing regex-based copy-number extraction
• add a regression test covering % and _ in flow names so unrelated matches no longer inflate the next suffix

Testing

• git diff --check -- src/backend/base/langflow/api/v1/flows_helpers.py src/backend/tests/unit/api/v1/test_rename_flow_to_save.py
• python3 -m py_compile src/backend/base/langflow/api/v1/flows_helpers.py src/backend/tests/unit/api/v1/test_rename_flow_to_save.py
• uvx ruff check src/backend/base/langflow/api/v1/flows_helpers.py src/backend/tests/unit/api/v1/test_rename_flow_to_save.py
• uv run python -m pytest -q tests/unit/api/v1/test_rename_flow_to_save.py -k "duplicate_flow_name_escapes_like_wildcards or duplicate_flow_name_regex_patterns" (started locally but did not return in a reasonable time window in this checkout; repository CI should provide the authoritative run)

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