Feat: Update settings tab implemented.

Auto-updates now configurable (URL, source (gitea or private server), log activity for auto updates.
fix: Update now hardened to prevent installation of corrupt or incorrect .exe files. (security to be hardened in the future)

series3_watcher.py

@@ -1,5 +1,5 @@
 """
-Series 3 Watcher — v1.4.2
+Series 3 Watcher — v1.4.3
 
 Environment:
 - Python 3.8 (Windows 7 compatible)
@@ -78,6 +78,10 @@ def load_config(path: str) -> Dict[str, Any]:
         "API_INTERVAL_SECONDS": get_int("API_INTERVAL_SECONDS", 300),
         "SOURCE_ID": get_str("SOURCE_ID", gethostname()),
         "SOURCE_TYPE": get_str("SOURCE_TYPE", "series3_watcher"),
+
+        # Auto-updater source
+        "UPDATE_SOURCE": get_str("UPDATE_SOURCE", "gitea"),
+        "UPDATE_URL":    get_str("UPDATE_URL", ""),
     }
 
 
@@ -215,7 +219,7 @@ def scan_latest(
 
 
 # --- API heartbeat / SFM telemetry helpers ---
-VERSION = "1.4.2"
+VERSION = "1.4.3"
 
 
 def _read_log_tail(log_file: str, n: int = 25) -> Optional[list]: