Add missing timeouts to all subprocess calls

Add timeout=30 to smartctl -i calls in _get_drive_details() and
_check_disk_firmware(), and dmidecode in _check_memory_usage().
Add TimeoutExpired handler in _check_disk_firmware(). Prevents
potential hangs when drives or system tools become unresponsive.

Resolves #9

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

hwmonDaemon.py

@@ -1051,7 +1051,8 @@ class SystemHealthMonitor:
                 ['smartctl', '-i', device],
                 stdout=subprocess.PIPE,
                 stderr=subprocess.PIPE,
-                text=True
+                text=True,
+                timeout=30
             )
             
             # Check if smartctl failed completely
@@ -2065,7 +2066,8 @@ class SystemHealthMonitor:
                 ['smartctl', '-i', device],
                 stdout=subprocess.PIPE,
                 stderr=subprocess.PIPE,
-                text=True
+                text=True,
+                timeout=30
             )
 
             model_line = None
@@ -2105,6 +2107,8 @@ class SystemHealthMonitor:
             logger.debug(f"Known issues: {firmware_info['known_issues']}")
             logger.debug("=== End Firmware Check ===\n")
 
+        except subprocess.TimeoutExpired:
+            logger.warning(f"smartctl -i timed out for {device}")
         except Exception as e:
             firmware_info['known_issues'].append(f"Error checking firmware: {str(e)}")
 
@@ -2813,7 +2817,8 @@ class SystemHealthMonitor:
                 ['dmidecode', '--type', 'memory'],
                 stdout=subprocess.PIPE,
                 stderr=subprocess.PIPE,
-                text=True
+                text=True,
+                timeout=30
             )
             if 'Error Correction Type: Multi-bit ECC' in result.stdout:
                 memory_health['has_ecc'] = True