feat(security): harden subprocess execution, validate inputs

Resolve absolute paths for proxmox-backup-manager/proxmox-backup-debug and constrain PATH
Add stable locale for subprocesses and enforce timeouts for manager/list/show and debug/inspect
Introduce safe run_cmd with env/timeout and better timeout error reporting
Validate datastore names via regex; reject invalid identifiers
Add resolve_search_path to prevent path traversal; ensure paths stay under datastore root
Bump version to 2.4.1 and align README version
Rationale: reduce supply-chain and injection risks, prevent path escapes, and improve robustness on PBS Linux hosts

Author: VoltKraft

PBS_Chunk_Checker.py

@@ -85,7 +85,7 @@ def _format_command(cmd: object) -> str:
 
 def clear_console() -> None:
     """Clear the terminal similar to the POSIX 'clear' command."""
-    # ANSI full reset works for most modern terminals, including modern Windows terminals
+    # ANSI full reset works for Linux terminal emulators
     print("\033c", end="", flush=True)
 
 def format_elapsed(seconds: float) -> str:

README.md

@@ -7,7 +7,7 @@ It calculates the **real disk space usage** of a specific **namespace**, **VM**,
 
 This allows accurate insights into space consumption per tenant or object — useful for chargeback, reporting, and storage optimization.
 
-**Current version:** 2.4.0 (`./PBS_Chunk_Checker.py --version`)
+**Current version:** 2.4.1 (`./PBS_Chunk_Checker.py --version`)
 
 ---
 
@@ -136,6 +136,7 @@ Notes:
 ## ⚠️ Notes
 
 - The script requires **no additional Python packages** — it uses only built-in modules.
+- Runs on **Linux PBS hosts**; other operating systems are not supported.
 - It must be executed **directly on a PBS host** because it depends on:
   - `proxmox-backup-manager`
   - `proxmox-backup-debug`