chore: migrate from deprecated golang/mock to go.uber.org/mock

[retr0h]

Summary

• Replace github.com/golang/mock with the maintained go.uber.org/mock fork
• Update all go:generate directives (93 files)
• Update all gomock imports (93 files)
• Update go.mod tool section: go.uber.org/mock/mockgen
• Regenerate all mocks with the new toolchain
• Auto-format import ordering for go.uber.org group

github.com/golang/mock is archived and no longer maintained. go.uber.org/mock is the official successor.

Test plan

• go build ./... compiles
• go test ./... all pass (0 failures)
• golangci-lint zero issues
• Zero remaining golang/mock references in codebase

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@           Coverage Diff           @@
##             main     #377   +/-   ##
=======================================
  Coverage   99.91%   99.91%           
=======================================
  Files         484      484           
  Lines       24721    24721           
=======================================
  Hits        24699    24699           
  Misses         14       14           
  Partials        8        8           

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