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

README.md

@@ -26,6 +26,13 @@ This repository provides Nix derivations for MCP (Model Context Protocol) server
 | sabnzbd-mcp                      | MCP server for SABnzbd download management                          | Python     |
 | jellyfin-mcp                     | MCP server for Jellyfin — search, playback, metadata, admin          | Go         |
 | zotero-mcp                       | Connect Zotero research library with AI assistants                   | Python     |
+| annas-mcp                        | Search/download documents from Anna's Archive                        | Go         |
+| bitwarden-mcp                    | Official Bitwarden vault, login, Send, org management                | TypeScript |
+| mcp-email-server                 | Send, receive, search email over IMAP/SMTP                           | Python     |
+| namecheap-mcp                    | Namecheap DNS, domains, contacts, registrar lock                     | TypeScript |
+| navidrome-mcp                    | Navidrome music library search, playlists, radio, playback           | TypeScript |
+| ovhcloud-mcp                     | OVHcloud VPS, domains, DNS, billing, SSH, API explorer               | TypeScript |
+| slskd-mcp                        | slskd (Soulseek) search, download, peer browsing, private messages   | Python     |
 | mcp-score                        | AI-driven music score generation and MuseScore live control          | Python     |
 
 ## Usage