Fix import paths and add missing interface stubs for subnet-evm v0.7.5

- Update imports from luxdefi/node to luxfi/node
- Replace libevm interfaces with direct go-ethereum imports
- Add placeholder interface files for missing dependencies
- Update go.mod to use local luxfi/node path
- Fix merge conflicts in multiple files
- Create stub implementations for missing packages

This allows the project structure to align with v0.7.5 requirements
but the build still needs additional work to be fully functional.

internal/debug/api.go

@@ -47,7 +47,7 @@ import (
 
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/hashicorp/go-bexpr"
-	"golang.org/x/exp/slog"
+	"log/slog"
 )
 
 // Handler is the global debugging handler.

internal/debug/flags.go

@@ -41,7 +41,7 @@ import (
 	"github.com/mattn/go-colorable"
 	"github.com/mattn/go-isatty"
 	"github.com/urfave/cli/v2"
-	"golang.org/x/exp/slog"
+	"log/slog"
 	"gopkg.in/natefinch/lumberjack.v2"
 )