fix: repoint sabnzbd-mcp to jasonpaulso fork, drop broken annas-mcp

- sabnzbd-mcp: original upstream (jmagar/sabnzbd-mcp) was deleted from
  GitHub (404). Repoint to jasonpaulso/sabnzbd-mcp fork, which preserves
  the same file layout and the /sabnzbd/api string postPatch rewrites.
- annas-mcp: remove package that was never completed (lib.fakeHash
  placeholders) and is not referenced anywhere in config-nixos. It was
  breaking 'nix flake check'.

packages/sabnzbd-mcp/package.nix

@@ -21,10 +21,14 @@ stdenv.mkDerivation {
   version = "0.1.0-unstable";
 
   src = fetchFromGitHub {
-    owner = "jmagar";
+    # Original upstream (jmagar/sabnzbd-mcp) was deleted from GitHub.
+    # Using jasonpaulso's fork, which preserves the same file layout
+    # (client.py + sabnzbd-mcp-server.py at repo root) and the
+    # /sabnzbd/api string that postPatch below rewrites.
+    owner = "jasonpaulso";
     repo = "sabnzbd-mcp";
-    rev = "9d691ed70b72397fddec03ca4ec68c81b30c79c3";
-    hash = "sha256-1sEnHH40cDVT5oiZD2Xywl7S9vJThii/ce+6r+XmpSw=";
+    rev = "8755e70e2634c02c24471f32962224833877dc81";
+    hash = "sha256-y46jTXBsOXMoFnnwyv0n+8uq2Z/kw2HbnZC85knWpUw=";
   };
 
   nativeBuildInputs = [ makeWrapper ];