Add MCP server packages: annas, bitwarden, email, namecheap, navidrome, ovhcloud, slskd

Packages MCP servers currently used by Hermes that were not yet in this
repo. Real hashes computed via nix build on wilkes; nix flake check passes.

- annas-mcp: Go, buildGoModule (re-added, previously dropped as broken)
- bitwarden-mcp: npm @bitwarden/mcp-server
- mcp-email-server: Python, buildPythonApplication
- namecheap-mcp: npm namecheap-api-mcp
- navidrome-mcp: npm navidrome-mcp
- ovhcloud-mcp: npm from GitHub, tsc build step
- slskd-mcp: Python, fastmcp wrapper

packages/ovhcloud-mcp/package.nix

@@ -0,0 +1,34 @@
+{
+  lib,
+  buildNpmPackage,
+  fetchFromGitHub,
+}:
+
+buildNpmPackage rec {
+  pname = "ovhcloud-mcp";
+  version = "2.0.1";
+
+  src = fetchFromGitHub {
+    owner = "hlebtkachenko";
+    repo = "ovhcloud-mcp";
+    rev = "ccadc85bd4aab35434a24732bc77ef2b6f100b4c";
+    hash = "sha256-FYJSKOU/lCutGCUJhaAtKWBLJOBUyWvdkSnMWbxwhI4=";
+  };
+
+  npmDepsHash = "sha256-myeqksb3mjJ1GJej/4D7iuyOOTsGJBdkka9zUpH+flY=";
+
+  postPatch = ''
+    cp ${./package-lock.json} package-lock.json
+  '';
+
+  # dist/ is NOT committed to the repo; buildNpmPackage runs "npm run build"
+  # (tsc) by default, which emits dist/index.js.
+
+  meta = with lib; {
+    description = "OVHcloud MCP server - VPS, domains, DNS, billing, SSH, and API explorer";
+    homepage = "https://github.com/hlebtkachenko/ovhcloud-mcp";
+    license = licenses.mit;
+    mainProgram = "ovhcloud-mcp";
+    platforms = platforms.all;
+  };
+}