refactor(test): move issue #1370 geometry test to cl/_testgo/interface1370

- Move geometry package from _demo to cl/_testdata/geometry1370
- Create simplified test in cl/_testgo/interface1370 following interface test pattern
- Generate .ll file with llgen to verify interface metadata package path fix
- Remove old demo files (issue1370_geometry, issue1370_goast, issue1370_gotypes)
- Remove .tmp-comment files

The new test structure is simpler and follows the existing cl/_testgo/interface pattern,
focusing on demonstrating the interface metadata fix for private methods across packages.

Generated with [codeagent](https://github.com/qbox/codeagent)
Co-authored-by: luoliwoshang <51194195+luoliwoshang@users.noreply.github.com>

_demo/go/issue1370_geometry/geometry.go

@@ -1,32 +0,0 @@
-package main
-
-import (
-	"fmt"
-
-	"github.com/goplus/llgo/_demo/go/issue1370_geometry/geometry"
-)
-
-func main() {
-	rect := geometry.NewRectangle(5.0, 3.0)
-
-	err := geometry.RegisterShape(rect, 42)
-	if err != nil {
-		println("FAIL: RegisterShape returned error")
-		return
-	}
-
-	if rect.GetID() != 42 {
-		println("FAIL: ID not set correctly")
-		return
-	}
-
-	area := rect.Area()
-	fmt.Printf("Area: %.1f\n", area)
-
-	if area != 15.0 {
-		println("FAIL: Area calculation incorrect")
-		return
-	}
-
-	println("SUCCESS: Custom interface with private methods works correctly")
-}

_demo/go/issue1370_geometry/geometry/geometry.go

@@ -1,26 +0,0 @@
-package geometry
-
-type Shape interface {
-	Area() float64
-	validate() bool
-	setID(int)
-}
-
-type Rectangle struct {
-	Width, Height float64
-	id            int
-}
-
-func (r *Rectangle) Area() float64  { return r.Width * r.Height }
-func (r *Rectangle) validate() bool { return r.Width > 0 && r.Height > 0 }
-func (r *Rectangle) setID(id int)   { r.id = id }
-func (r *Rectangle) GetID() int     { return r.id }
-
-func NewRectangle(width, height float64) *Rectangle {
-	return &Rectangle{Width: width, Height: height}
-}
-
-func RegisterShape(s Shape, id int) error {
-	s.setID(id)
-	return nil
-}

_demo/go/issue1370_goast/goast.go

@@ -1,25 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"go/ast"
-	"go/token"
-)
-
-func main() {
-	ident := &ast.Ident{
-		NamePos: token.Pos(42),
-		Name:    "foo",
-	}
-
-	var expr ast.Expr = ident
-	pos := expr.Pos()
-
-	fmt.Printf("Position: %d\n", pos)
-	if pos != 42 {
-		println("FAIL: Position mismatch")
-		return
-	}
-
-	println("SUCCESS: ast.Expr interface method calls work correctly")
-}

_demo/go/issue1370_gotypes/gotypes.go

@@ -1,24 +0,0 @@
-package main
-
-import (
-	"go/types"
-)
-
-func main() {
-	scope := types.NewScope(nil, 0, 0, "test")
-	obj := types.NewVar(0, nil, "x", types.Typ[types.Int])
-
-	scope.Insert(obj)
-
-	retrieved := scope.Lookup("x")
-	if retrieved == nil {
-		println("FAIL: Lookup returned nil")
-		return
-	}
-	if retrieved.Name() != "x" {
-		println("FAIL: Name mismatch")
-		return
-	}
-
-	println("SUCCESS: Scope.Insert and Lookup work correctly")
-}