terra: package Tome, add vivaldi + dotnet dev tools

Tome (née AudibleLibrary) is darman's own Photino/.NET desktop app, private
repo on our own gitea. Fetched as a flake input over ssh with darman's
ambient key — same mechanism as any other git input, private or not.

buildDotnetModule package: the Preact/Vite frontend (Tome.App/ClientApp)
builds as its own buildNpmPackage derivation and gets copied into the
published app's wwwroot, since upstream's in-project MSBuild npm target has
no network access in the Nix sandbox. Photino.Native's runtime deps (gtk3,
webkitgtk_4_1, libnotify) are wrapped in — confirmed via readelf/ldd that
this Photino build already targets webkit2gtk-4.1, not the now-removed 4.0.

Also added dotnet-sdk + nodejs to terra for developing Tome locally, and
vivaldi (unfree, extends the existing allowUnfreePredicate).

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

flake.lock

@@ -425,7 +425,8 @@
         "nixpkgs": "nixpkgs_2",
         "nixpkgs-unstable": "nixpkgs-unstable",
         "proton-pass-cli": "proton-pass-cli",
-        "sops-nix": "sops-nix"
+        "sops-nix": "sops-nix",
+        "tome": "tome"
       }
     },
     "sops-nix": {
@@ -463,6 +464,22 @@
         "type": "github"
       }
     },
+    "tome": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1784844989,
+        "narHash": "sha256-b9cr5QeVx+GSUTU0Wc85jqhg8FCFIKZ5TI1k4CE2Ca0=",
+        "ref": "refs/heads/master",
+        "rev": "4b48640dcd66cdb2e6922a1fc50b28dbfb8b67ef",
+        "revCount": 45,
+        "type": "git",
+        "url": "ssh://gitea@git.mgaction.town:2222/darman/TOME.git"
+      },
+      "original": {
+        "type": "git",
+        "url": "ssh://gitea@git.mgaction.town:2222/darman/TOME.git"
+      }
+    },
     "uv2nix": {
       "inputs": {
         "nixpkgs": [