Jack Ling 626fc629ef test(cmd/gf): enhance integration tests for gen pb command (#4644) ...

## Summary
- Add 2 new integration test cases for `gf gen pb` command
- `TestGenPb_MultipleTags`: tests multiple validation tags (v:required,
v:#Id > 0, v:email) and dc tags
- `TestGenPb_NestedMessage`: tests nested message structures with
various tag types

## Test Data
- Add `testdata/genpb/multiple_tags.proto` - proto file with multiple
tag annotations
- Add `testdata/genpb/nested_message.proto` - proto file with nested
message structures

## Test Plan
- [x] Run `go test -v -run "TestGenPb" ./...` - all 4 tests pass (2
existing + 2 new)

2026-01-21 19:11:45 +08:00

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gf

test(cmd/gf): enhance integration tests for gen pb command (#4644)

2026-01-21 19:11:45 +08:00