Add pdm package manager support

PDM is a modern Python package manager using pyproject.toml (PEP 621).
Uses the same MITM-only proxy approach as poetry/uv/pipx — all malware
detection and minimum package age enforcement happens at the proxy layer
by intercepting PyPI requests.

packages/safe-chain/src/shell-integration/helpers.js

@@ -102,6 +102,12 @@ export const knownAikidoTools = [
     ecoSystem: ECOSYSTEM_PY,
     internalPackageManagerName: "pipx",
   },
+  {
+    tool: "pdm",
+    aikidoCommand: "aikido-pdm",
+    ecoSystem: ECOSYSTEM_PY,
+    internalPackageManagerName: "pdm",
+  },
   // When adding a new tool here, also update the documentation for the new tool in the README.md
 ];