terra: add proton-pass-cli via flake input

Not in nixpkgs; packaged by github:tomsch/proton-pass-cli-nix. Used by
./scripts/deploy to autofill sudo/ssh passwords from the "HomeLab" vault.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

flake.lock

@@ -295,6 +295,26 @@
         "type": "github"
       }
     },
+    "proton-pass-cli": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1783676260,
+        "narHash": "sha256-J7yTLWLkhOOGT/YLyfgC3lEOCRTOXVK3h0UoKzhRels=",
+        "owner": "tomsch",
+        "repo": "proton-pass-cli-nix",
+        "rev": "1cad55698affce949d4cebacae31db448c17d9f1",
+        "type": "github"
+      },
+      "original": {
+        "owner": "tomsch",
+        "repo": "proton-pass-cli-nix",
+        "type": "github"
+      }
+    },
     "pyproject-build-systems": {
       "inputs": {
         "nixpkgs": [
@@ -404,6 +424,7 @@
         "nixos-images": "nixos-images",
         "nixpkgs": "nixpkgs_2",
         "nixpkgs-unstable": "nixpkgs-unstable",
+        "proton-pass-cli": "proton-pass-cli",
         "sops-nix": "sops-nix"
       }
     },