feat(x1): enable cratedocs-mcp service and update dependencies

- Enabled the cratedocs-mcp service in the x1 configuration.
- Added `cratedocs` as a new flake input and included its modules and overlay.
- Updated multiple flake inputs (`nixpkgs`, `rust-overlay`, etc.) with new revisions.

flake.nix

@@ -7,6 +7,11 @@
     # NixPkgs Unstable (nixos-unstable)
     unstable.url = "github:nixos/nixpkgs/nixos-unstable";
 
+    cratedocs = {
+      url = "git+https://git.hoyer.xyz/harald/cratedocs-mcp.git";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+
     crane.url = "github:ipetkov/crane/v0.20.3";
     rust-overlay = {
       url = "github:oxalica/rust-overlay";
@@ -98,6 +103,7 @@
         sops-nix.nixosModules.sops
         disko.nixosModules.disko
         simple-nixos-mailserver.nixosModule
+        cratedocs.nixosModules.default
       ];
 
       overlays = with inputs; [
@@ -105,6 +111,9 @@
         (final: prev: {
           inherit (claude.packages.${prev.system}) claude-desktop-with-fhs;
         })
+        (final: prev: {
+          inherit (cratedocs.packages.${prev.system}) cratedocs-mcp;
+        })
       ];
 
       outputs-builder = channels: {