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/relay-free-llm/package.nix

@@ -9,12 +9,12 @@
 let
   cerebras-cloud-sdk = python3Packages.buildPythonPackage rec {
     pname = "cerebras-cloud-sdk";
-    version = "1.67.0";
+    version = "1.91.0";
     pyproject = true;
 
     src = fetchurl {
-      url = "https://files.pythonhosted.org/packages/92/12/c201f07582068141e88f9a523ab02fdc97de58f2f7c0df775c6c52b9d8dd/cerebras_cloud_sdk-1.67.0.tar.gz";
-      hash = "sha256-Ou1vhsbHqD7p1M+wiirOoInOvyr1uK7RFu95mVpPSBM=";
+      url = "https://files.pythonhosted.org/packages/0c/98/767ab62618be157b5fb21bce980ad5c8ebe155e32aff38521e511054e5c3/cerebras_cloud_sdk-1.91.0.tar.gz";
+      hash = "sha256-b0GT/sCIkR/+gpzlaCUQ+GEgzTUyyvToVAvzO1n9t+s=";
     };
 
     build-system = with python3Packages; [
@@ -65,8 +65,8 @@ python3Packages.buildPythonApplication {
   src = fetchFromGitHub {
     owner = "msmarkgu";
     repo = "RelayFreeLLM";
-    rev = "fea9e1642dbbc5c0980885f41b21aa04a30090a2";
-    hash = "sha256-ZLAVhJFrVFjqAz0f4qOi2REBDccIc8g2H9b7dcqcYRU=";
+    rev = "96e6c48a552755bf250c3155b14176916c69d8d8";
+    hash = "sha256-SNux6hVOij+2kYFH/gUQQj8QLfxGzjcdakkZ48AIWPU=";
   };
 
   nativeBuildInputs = [ makeWrapper ];