refactor: drop legacy // +build comment

[eroderust]

Abstract

• Closes #AAA or https://github.../issue/AAA

From Go 1.17, the preferred syntax for build constraints is //go:build,
which replaces the old // +build form. The old style is now considered
deprecated but still supported for backward compatibility.

This change removes the obsolete // +build xxx line, keeping only the
modern //go:build xxx directive.

More info: golang/go#41184 and https://go.dev/doc/go1.17#build-lines

Design Doc / Proposal：
https://go.dev/design/draft-gobuild

[gemini-code-assist]

Code Review

This pull request correctly removes the legacy // +build build constraint from app/appconst/pebbledb.go, aligning the codebase with modern Go practices introduced in Go 1.17. The change is a simple and effective refactoring that improves code clarity and maintainability. The change is approved.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.04%. Comparing base (0d69e1d) to head (29de4cf).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2482      +/-   ##
==========================================
- Coverage   59.11%   59.04%   -0.08%     
==========================================
  Files         359      359              
  Lines       24257    24257              
==========================================
- Hits        14340    14322      -18     
- Misses       8692     8713      +21     
+ Partials     1225     1222       -3     

Files with missing lines	Coverage Δ
app/appconst/pebbledb.go	100.00% <ø> (ø)

... and 1 file with indirect coverage changes

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