fix(api): restore CJK keyword search in workflow logs broken by PR #30450

[ifer47]

Summary

• Workflow log keyword search returns empty results for Chinese/CJK characters since v1.11.0 (PR fix(api): refactors the SQL LIKE pattern escaping logic to use a centralized utility function, ensuring consistent and secure handling of special characters across all database queries. #30450)
• PR fix(api): refactors the SQL LIKE pattern escaping logic to use a centralized utility function, ensuring consistent and secure handling of special characters across all database queries. #30450 replaced unicode_escape encoding with escape_like_pattern() for SQL injection safety, but broke CJK search because json.dumps() defaults to ensure_ascii=True, storing CJK characters as \uXXXX escape sequences in the database
• This fix adds a dual-search strategy: when the keyword contains non-ASCII characters, both the raw-CJK form and the unicode-escaped form are used as LIKE patterns (OR'd together), ensuring matches regardless of serialization format

Root Cause

Before PR #30450, the code used:

keyword_like_val = f"%{keyword[:30].encode('unicode_escape').decode('utf-8')}%".replace(r"\u", r"\u")

This converted CJK keywords to \uXXXX format, matching how json.dumps(ensure_ascii=True) stores data in PostgreSQL. PR #30450 replaced this with escape_like_pattern() which only escapes SQL LIKE wildcards (%, _, \), so searching for raw 你好 cannot match \u4f60\u597d stored in the database.

Fix

When the keyword contains non-ASCII characters:

• Search for raw CJK form: ILIKE '%你好%' ESCAPE '\' — matches data stored with ensure_ascii=False (e.g., logstore backend)
• Also search for unicode-escaped form: ILIKE '%\u4f60\u597d%' ESCAPE '\' — matches data stored with ensure_ascii=True (default)

Pure ASCII keywords skip the extra search to avoid unnecessary overhead.

Test plan

• Unit tests added in test_workflow_app_log_cjk_search.py covering CJK, mixed ASCII+CJK, pure ASCII, and LIKE special character edge cases
• Manual testing: create a workflow app with Chinese input, run it, search for Chinese keywords in workflow logs
• Verify English keyword search still works as expected

Closes #37367

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