feat: add GetManPage function and integrate parent process name in ProcessDetail

backend/sysinfo.go

@@ -211,6 +211,7 @@ type ProcessDetail struct {
 	Username       string  `json:"username"`
 	CreatedAt      int64   `json:"created_at"`    // unix ms
 	ParentPID      int32   `json:"parent_pid"`
+	ParentName     string  `json:"parent_name"`
 	Nice           int32   `json:"nice"`
 	NumThreads     int32   `json:"num_threads"`
 	NumFDs         int32   `json:"num_fds"`
@@ -258,6 +259,13 @@ func FetchProcessDetail(pid int32) (*ProcessDetail, error) {
 	}
 	if v, e := p.Ppid(); e == nil {
 		d.ParentPID = v
+		if d.ParentPID > 0 {
+			if pp, err2 := ps.NewProcess(d.ParentPID); err2 == nil {
+				if pname, err2 := pp.Name(); err2 == nil {
+					d.ParentName = pname
+				}
+			}
+		}
 	}
 	if v, e := p.Nice(); e == nil {
 		d.Nice = v
@@ -304,4 +312,30 @@ func KillProcess(pid int32, force bool) error {
 		return p.Kill()
 	}
 	return p.Terminate()
+}
+// GetManPage returns the plain-text man page for the given command name.
+// Returns an empty string if man is not installed or the page does not exist.
+func GetManPage(name string) string {
+	ctx, cancel := context.WithTimeout(context.Background(), 4*time.Second)
+	defer cancel()
+	cmd := exec.CommandContext(ctx, "man", "-P", "cat", name)
+	out, err := cmd.Output()
+	if err != nil {
+		return ""
+	}
+	// Strip nroff backspace-based bold/underline formatting (char + backspace + char)
+	raw := []byte(out)
+	cleaned := make([]byte, 0, len(raw))
+	for i := 0; i < len(raw); i++ {
+		if i+1 < len(raw) && raw[i+1] == '\b' {
+			i++ // skip formatting char and backspace; the real char follows
+		} else {
+			cleaned = append(cleaned, raw[i])
+		}
+	}
+	text := strings.TrimSpace(string(cleaned))
+	if len(text) > 12000 {
+		text = text[:12000] + "\n…[truncated]"
+	}
+	return text
 }