Refine Go runtime behavior and log handling

VRWT_Tool/VRC_OSC/internal/app/runtime.go

@@ -0,0 +1,48 @@
+package app
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"time"
+
+	"vrc_osc_go/internal/common"
+)
+
+func appendRuntimeLog(title, text string) error {
+	dir := filepath.Join(common.RootDir(), "runtime")
+	if err := os.MkdirAll(dir, 0o755); err != nil {
+		return err
+	}
+	path := filepath.Join(dir, "runtime.log")
+	body := text
+	if body == "" {
+		body = "(empty)"
+	}
+	f, err := os.OpenFile(path, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0o644)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	_, err = fmt.Fprintf(f, "\n[%s] %s\n%s\n", time.Now().Format("2006-01-02 15:04:05"), title, body)
+	return err
+}
+
+func appendJoinLeaveLog(text string) error {
+	dir := filepath.Join(common.RootDir(), "runtime")
+	if err := os.MkdirAll(dir, 0o755); err != nil {
+		return err
+	}
+	path := filepath.Join(dir, "join_leave.log")
+	body := text
+	if body == "" {
+		body = "(empty)"
+	}
+	f, err := os.OpenFile(path, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0o644)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	_, err = fmt.Fprintf(f, "\n[%s] VRC JOIN/LEAVE\n%s\n", time.Now().Format("2006-01-02 15:04:05"), body)
+	return err
+}