Simplify disk detection to single lsblk call with full paths

Replace dual-method detection (lsblk + glob scanning) with single
lsblk -p call that returns full device paths directly. Adds timeout,
returns sorted results for consistency.

Resolves #14

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

hwmonDaemon.py

@@ -1934,42 +1934,26 @@ class SystemHealthMonitor:
     # DISK AND STORAGE UTILITY METHODS
     # =============================================================================
     def _get_all_disks(self) -> List[str]:
-        """Get all physical disks using multiple detection methods."""
+        """Get all physical disks using lsblk with full device paths."""
         disks = set()
-        
-        # Method 1: Use lsblk to get physical disks, excluding virtual devices
         try:
             result = subprocess.run(
-                ['lsblk', '-d', '-n', '-o', 'NAME,TYPE'],
+                ['lsblk', '-d', '-n', '-o', 'NAME,TYPE', '-p'],
                 stdout=subprocess.PIPE,
-                text=True
+                text=True,
+                timeout=10
             )
             for line in result.stdout.strip().split('\n'):
                 if line:
                     parts = line.split()
-                    if len(parts) >= 2:
-                        name, device_type = parts[0], parts[1]
-                        # Only include actual disks, exclude virtual devices
-                        if device_type == 'disk' and not name.startswith('rbd'):
-                            disks.add(f"/dev/{name}")
-            logger.debug(f"Physical disks found via lsblk: {disks}")
+                    if len(parts) >= 2 and parts[1] == 'disk' and not parts[0].startswith('/dev/rbd'):
+                        disks.add(parts[0])
+            logger.debug(f"Physical disks found: {disks}")
+        except subprocess.TimeoutExpired:
+            logger.error("lsblk timed out during disk detection")
         except Exception as e:
-            logger.debug(f"lsblk detection failed: {e}")
-
-        # Method 2: Direct device scanning for physical devices only
-        for pattern in ['/dev/sd[a-z]', '/dev/nvme[0-9]n[0-9]']:
-            try:
-                import glob
-                matches = glob.glob(pattern)
-                # Filter out partitions (devices ending in numbers for sd*, already filtered for nvme)
-                if 'sd' in pattern:
-                    matches = [d for d in matches if not d[-1].isdigit()]
-                disks.update(matches)
-                logger.debug(f"Disks found via glob {pattern}: {matches}")
-            except Exception as e:
-                logger.debug(f"Glob detection failed for {pattern}: {e}")
-
-        return list(disks)
+            logger.error(f"Failed to detect disks: {e}")
+        return sorted(disks)
 
     def _is_excluded_mount(self, mountpoint: str) -> bool:
         """Check if a mountpoint should be excluded from monitoring."""