api: improve search performance on the DAG List page

[yohamta]

• Improved the DAG list API to optimize the performance of filtering DAGs by their names

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 16 lines in your changes missing coverage. Please review.

Project coverage is 58.23%. Comparing base (fc360a6) to head (df069cc).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/persistence/local/dag_store.go	0.00%	16 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #757      +/-   ##
==========================================
- Coverage   58.29%   58.23%   -0.07%     
==========================================
  Files          68       68              
  Lines        6729     6736       +7     
==========================================
  Hits         3923     3923              
- Misses       2495     2502       +7     
  Partials      311      311              

Files with missing lines	Coverage Δ
internal/persistence/local/dag_store.go	0.00% <0.00%> (ø)

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update fc360a6...df069cc. Read the comment docs.