fix(store): add migration to normalize tag case #5426
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Add a data migration that runs on server startup to normalize all existing memo tags to lowercase. This prevents duplicate tags when old memos have mixed-case tags (e.g., #House) while new memos automatically use lowercase (e.g., #house). The migration: - Runs once and is tracked via system_setting - Processes memos in batches to avoid memory issues - Deduplicates tags during normalization - Skips memos that already have lowercase tags Fixes usememos#5363 Signed-off-by: majiayu000 <1835304752@qq.com>
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Summary
Fixes #5363
Test plan