go-xlan / go-migrate / 20164330975

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Add MigrationParam with unified resource management and status inspection

- Add newmigrate/migration_param.go with lazy initialization and singleton pattern
- Add migrationstate package with database version, pending migrations and schema diff inspection
- Update cobramigration to use MigrationParam with GetMigration()/cleanup pattern
- Update newscripts to use MigrationParam with GetDB()/GetMigration() returning (resource, cleanup)
- Update previewmigrate to use new cleanup pattern
- Update demo1x and demo2x with MigrationParam usage
- Add English/Chinese comments

- Add SVG architecture diagrams (go-migrate-overview.svg, go-migrate-workflow.svg)
- Add GitHub Actions workflow with Go 1.24+ support
- Update README documentation with new API examples
- Update dependencies in go.mod/go.sum

- Add migration_param_test.go

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