chore: update all packages to latest versions

- aionui 2.1.4 -> 2.1.50
- desloppify 0.9.15 -> 1.0
- ds4 -> 2026-08-05 (b030961)
- freebuff 0.0.85 -> 0.0.142 (binary moved to GitHub releases)
- graphify 0.7.10 -> 0.9.35 (license Apache-2.0, fix sed patterns for versioned deps)
- hipengine 0.2.2 -> 0.3.0 (console script renamed to hipengine)
- kubernetes-mcp-server 0.0.62 -> 0.0.66 (requires go >= 1.26.3)
- mcp-gateway 2.11.0 -> 3.4.0 (requires rustc >= 1.95)
- omniroute 3.8.28 -> 3.8.49
- radar 1.6.1 -> 1.9.1 (drop obsolete lockfile sed patch)
- relay-free-llm -> 96e6c48, cerebras-cloud-sdk 1.67.0 -> 1.91.0
- stakpak 0.3.86 -> 0.3.88

Add nixpkgs-latest input for toolchains newer than the pinned nixpkgs.

packages/mcp-gateway/package.nix

@@ -8,16 +8,16 @@
 
 rustPlatform.buildRustPackage rec {
   pname = "mcp-gateway";
-  version = "2.11.0";
+  version = "3.4.0";
 
   src = fetchFromGitHub {
     owner = "MikkoParkkola";
     repo = "mcp-gateway";
     rev = "v${version}";
-    hash = "sha256-7IALz7hOnCeKtiEm8b3M7v5oy4hw173viyhNeqQIhTI=";
+    hash = "sha256-shn2cv463SnegamsMu6NmfylnNaFzGJLoL2H7QhETY8=";
   };
 
-  cargoHash = "sha256-B5HRETFryzLqQhdIqRFj0apZS0wMggW2MHE2VsbB22Y=";
+  cargoHash = "sha256-XuOYuYapb2l7RHQIgLDfcDPtSdMDpEgti8Ud5ssuGC8=";
 
   nativeBuildInputs = [ pkg-config ];