update: bump 6 MCP packages + nixpkgs flake

- flake.lock: nixpkgs 2026-05-31 → 2026-06-16
- zotero-mcp: v0.2.2 → v0.5.0
- duckduckgo-mcp-server: 0.1.1-unstable → v0.4.0
- kindly-web-search-mcp-server: bump to latest commit + add trafilatura dep
- sabnzbd-mcp: pin to specific commit instead of refs/heads/main
- jellyfin-mcp: v2026.318.7 → v2026.604.2 (remove go.mod patch)
- nextcloud-mcp-server: v0.89.0 → v0.121.3

n8n-mcp, mcp-arr-server, pdf-reader-mcp held back:
upstream npm packages require @modelcontextprotocol/sdk versions
not yet published to npm registry

packages/kindly-web-search-mcp-server/package.nix

@@ -77,8 +77,8 @@ python313Packages.buildPythonApplication rec {
   src = fetchFromGitHub {
     owner = "Shelpuk-AI-Technology-Consulting";
     repo = "kindly-web-search-mcp-server";
-    rev = "2fd83d28710cce335f610e3d5ed0b403250ab1ba";
-    hash = "sha256-sOLx87p+w51wuBOItDdzrsrgItNZ92WivZAv3Zzp16o=";
+    rev = "2b76afb37bf311facbde6750d0a0c0cbdfb8fec2";
+    hash = "sha256-90QHr2FPiMSwKXmjlZ2W9NIQvj3LDXzYIq6m/Z+sJMw=";
   };
 
   build-system = with python313Packages; [
@@ -94,6 +94,7 @@ python313Packages.buildPythonApplication rec {
     nodriver
     pymupdf
     fastmcp
+    trafilatura
   ];
 
   nativeBuildInputs = [ makeWrapper ];