fix: Add input validation and bounds checking to parsing methods (#990)

* fix: Resolved boundary condition issues in string processing

Addressed null and length checks during string splitting across multiple model classes to prevent potential null pointer exceptions and array out-of-bounds errors

* fix: Throw exceptions instead of silently returning when package manager output formats are invalid

Modified the _pacman, _opkg, and _apk parsing methods to throw exceptions when input formats are invalid, rather than silently returning, to prevent potential error handling issues.

lib/data/model/server/cpu.dart

@@ -166,6 +166,7 @@ class SingleCpuCore extends TimeSeqIface<SingleCpuCore> {
       final id = item.split(' ').firstOrNull;
       if (id == null) continue;
       final matches = item.replaceFirst(id, '').trim().split(' ');
+      if (matches.length < 7) continue;
       cpus.add(
         SingleCpuCore(
           id,

lib/data/model/server/proc.dart

@@ -97,8 +97,8 @@ class Proc {
   }
 
   String get binary {
-    final parts = command.split(' ');
-    return parts[0];
+    final parts = command.trim().split(' ').where((e) => e.isNotEmpty).toList();
+    return parts.isNotEmpty ? parts[0] : '';
   }
 }