Optimize transfer history filtering and indexes

[YoshihitoAso]

📌 Description

This PR improves the performance characteristics of transfer history searches by removing partial-match searches for transaction_hash, from_address, and to_address, allowing indexed exact-match lookups to be used more effectively as transfer data grows.

✅ Related Issues

• Close [FEATURE] Improve the performance of the TransferHistory API #1858

🔄 Changes

• Changed transaction_hash, from_address, and to_address filters from LIKE '%...%' to exact-match conditions for transfer history APIs.
• Avoided unnecessary account_tag joins when account_tag is not specified.
• Added composite indexes for transfer history lookup and ID-ordered pagination patterns.
• Updated API schema/OpenAPI descriptions to document exact-match search behavior.
• Updated transfer history tests to use exact-match filter values.

📌 Checklist

• I have added tests where necessary.
• I have updated the documentation where necessary.

[github-actions]

Coverage Report •

File	Stmts	Miss	Branch	BrPart	Cover	Missing
app/api/routers
token.py	465	7	290	21	96%	267->269, 282->286, 299->303, 316->320, 326->329, 481->483, 489->491, 497->499, 512->516, 522->525, 560->561, 561, 701->702, 702, 864->865, 865, 878->879, 879, 883, 994->997, 1187->1190, 1379->1382, 1423->1427, 1427, 1623->1626, 1820->1823, 1864->1868, 1868
app/model/db
idx_transfer.py	37	0	0	0	100%
app/model/schema
token.py	202	0	0	0	100%
tests/app
token_transfer_history_ListAllTransferHistory_test.py	264	0	2	0	100%
token_transfer_history_ListTokenTransferHistory_test.py	545	0	2	0	100%
token_transfer_history_SearchTokenTransferHistory_test.py	742	0	2	0	100%
TOTAL	37458	1470	3524	647	95%

Tests	Skipped	Failures	Errors	Time
1281	0 💤	0 ❌	0 🔥	11m 5s ⏱️