feat: include Debian source package in apt get_packages

dpkg-query now also reports ${source:Package} as source_package for accurate
OSV vulnerability matching (binary -> source, e.g. libssl3 -> openssl).

napalm_linux/linux.py

@@ -813,17 +813,20 @@ class LinuxDriver(OSDriver):
 
     def _get_packages_apt(self) -> list[PackageDict]:
         out = self._send(
-            "dpkg-query -W -f='${Package}\\t${Version}\\t${Installed-Size}\\t${binary:Summary}\\n' 2>/dev/null"
+            "dpkg-query -W -f='${Package}\\t${Version}\\t${Installed-Size}"
+            "\\t${source:Package}\\t${binary:Summary}\\n' 2>/dev/null"
         )
         packages: list[PackageDict] = []
         for line in out.splitlines():
-            parts = line.split("\t", 3)
+            parts = line.split("\t", 4)
             if len(parts) < 2:
                 continue
             name = parts[0].strip()
             version = parts[1].strip()
             size = int(parts[2].strip()) * 1024 if len(parts) > 2 and parts[2].strip().isdigit() else 0
-            description = parts[3].strip() if len(parts) > 3 else ""
+            # Debian source package (e.g. openssh-server → openssh) for OSV matching.
+            source_package = parts[3].strip() if len(parts) > 3 and parts[3].strip() else name
+            description = parts[4].strip() if len(parts) > 4 else ""
             packages.append({
                 "name": name,
                 "version": version,
@@ -831,6 +834,7 @@ class LinuxDriver(OSDriver):
                 "description": description,
                 "size": size,
                 "source": "apt",
+                "source_package": source_package,
             })
         return packages