feat(cmd/gf): gen dao suppport for dm database

[hailaz]

将来合并后直接指定tag
go run -tags dm github.com/gogf/gf/cmd/gf/v2@latest
go install -tags dm github.com/gogf/gf/cmd/gf/v2@latest

测试
go run -tags dm github.com/gogf/gf/cmd/gf/v2@a7f551c40f3c83b00eae15a65fd4463332b1ed2e
go install -tags dm github.com/gogf/gf/cmd/gf/v2@a7f551c40f3c83b00eae15a65fd4463332b1ed2e

[Copilot]

Pull request overview

This PR adds optional support for the 达梦 (DM) database driver in the gf CLI DAO generator by gating the DM driver import behind a dm build tag, enabling go run|install -tags dm ... usage without impacting default builds.

Changes:

• Removes the previously commented-out DM driver import note from the default DAO generator command file.
• Adds a new //go:build dm-guarded file that blank-imports the DM driver when the dm tag is enabled.
• Updates cmd/gf module dependencies (go.mod/go.sum) to include the DM driver and its indirect dependencies.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 1 comment.

File	Description
cmd/gf/internal/cmd/cmd_gen_dao.go	Removes the old “do not add dm” commented guidance from the default driver import list.
cmd/gf/internal/cmd/cmd_gen_dao_dm.go	Adds a dm build-tagged blank import to enable DM driver registration when requested.
cmd/gf/go.mod	Adds contrib/drivers/dm/v2 and related indirect dependencies to support -tags dm builds.
cmd/gf/go.sum	Records checksums for the newly introduced DM driver dependency chain.

Comments suppressed due to low confidence (1)

cmd/gf/go.mod:12

• cmd/gf adds a direct requirement on github.com/gogf/gf/contrib/drivers/dm/v2, but the only import is behind the non-default build tag dm (see cmd_gen_dao_dm.go). Running go mod tidy without GOFLAGS=-tags=dm will typically drop this requirement/go.sum entries, which can silently break the advertised go run|install -tags dm ... flow after routine tidying (CI currently runs go mod tidy in each module without tags). Consider updating the repo’s tidy automation for cmd/gf to run with GOFLAGS=-tags=dm (or otherwise preserve tag-gated deps) so the dependency isn’t removed.

require (
	github.com/gogf/gf/contrib/drivers/clickhouse/v2 v2.10.2
	github.com/gogf/gf/contrib/drivers/dm/v2 v2.10.2
	github.com/gogf/gf/contrib/drivers/mssql/v2 v2.10.2
	github.com/gogf/gf/contrib/drivers/mysql/v2 v2.10.2
	github.com/gogf/gf/contrib/drivers/oracle/v2 v2.10.2
	github.com/gogf/gf/contrib/drivers/pgsql/v2 v2.10.2
	github.com/gogf/gf/contrib/drivers/sqlite/v2 v2.10.2

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