flake: remove sops-nix (no longer used)

All secrets are now managed by OpenBao (Vault). Remove the legacy
sops-nix infrastructure that is no longer in use.

Removed:
- sops-nix flake input
- system/sops.nix module
- .sops.yaml configuration file
- Age key generation from template prepare-host scripts

Updated:
- flake.nix - removed sops-nix references from all hosts
- flake.lock - removed sops-nix input
- scripts/create-host/ - removed sops references
- CLAUDE.md - removed SOPS documentation

Note: secrets/ directory should be manually removed by the user.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

flake.nix

@@ -5,10 +5,6 @@
     nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-25.11";
     nixpkgs-unstable.url = "github:nixos/nixpkgs?ref=nixos-unstable";
 
-    sops-nix = {
-      url = "github:Mic92/sops-nix";
-      inputs.nixpkgs.follows = "nixpkgs-unstable";
-    };
     alerttonotify = {
       url = "git+https://git.t-juice.club/torjus/alerttonotify?ref=master";
       inputs.nixpkgs.follows = "nixpkgs-unstable";
@@ -28,7 +24,6 @@
       self,
       nixpkgs,
       nixpkgs-unstable,
-      sops-nix,
       alerttonotify,
       nixos-exporter,
       homelab-deploy,
@@ -55,7 +50,6 @@
             system.configurationRevision = self.rev or self.dirtyRev or "dirty";
           }
         )
-        sops-nix.nixosModules.sops
         nixos-exporter.nixosModules.default
         homelab-deploy.nixosModules.default
         ./modules/homelab
@@ -74,7 +68,7 @@
         ns1 = nixpkgs.lib.nixosSystem {
           inherit system;
           specialArgs = {
-            inherit inputs self sops-nix;
+            inherit inputs self;
           };
           modules = commonModules ++ [
             ./hosts/ns1
@@ -83,7 +77,7 @@
         ns2 = nixpkgs.lib.nixosSystem {
           inherit system;
           specialArgs = {
-            inherit inputs self sops-nix;
+            inherit inputs self;
           };
           modules = commonModules ++ [
             ./hosts/ns2
@@ -92,7 +86,7 @@
         ha1 = nixpkgs.lib.nixosSystem {
           inherit system;
           specialArgs = {
-            inherit inputs self sops-nix;
+            inherit inputs self;
           };
           modules = commonModules ++ [
             ./hosts/ha1
@@ -101,7 +95,7 @@
         template1 = nixpkgs.lib.nixosSystem {
           inherit system;
           specialArgs = {
-            inherit inputs self sops-nix;
+            inherit inputs self;
           };
           modules = commonModules ++ [
             ./hosts/template
@@ -110,7 +104,7 @@
         template2 = nixpkgs.lib.nixosSystem {
           inherit system;
           specialArgs = {
-            inherit inputs self sops-nix;
+            inherit inputs self;
           };
           modules = commonModules ++ [
             ./hosts/template2
@@ -119,7 +113,7 @@
         http-proxy = nixpkgs.lib.nixosSystem {
           inherit system;
           specialArgs = {
-            inherit inputs self sops-nix;
+            inherit inputs self;
           };
           modules = commonModules ++ [
             ./hosts/http-proxy
@@ -128,7 +122,7 @@
         monitoring01 = nixpkgs.lib.nixosSystem {
           inherit system;
           specialArgs = {
-            inherit inputs self sops-nix;
+            inherit inputs self;
           };
           modules = commonModules ++ [
             ./hosts/monitoring01
@@ -137,7 +131,7 @@
         jelly01 = nixpkgs.lib.nixosSystem {
           inherit system;
           specialArgs = {
-            inherit inputs self sops-nix;
+            inherit inputs self;
           };
           modules = commonModules ++ [
             ./hosts/jelly01
@@ -146,7 +140,7 @@
         nix-cache01 = nixpkgs.lib.nixosSystem {
           inherit system;
           specialArgs = {
-            inherit inputs self sops-nix;
+            inherit inputs self;
           };
           modules = commonModules ++ [
             ./hosts/nix-cache01
@@ -155,7 +149,7 @@
         pgdb1 = nixpkgs.lib.nixosSystem {
           inherit system;
           specialArgs = {
-            inherit inputs self sops-nix;
+            inherit inputs self;
           };
           modules = commonModules ++ [
             ./hosts/pgdb1
@@ -164,7 +158,7 @@
         nats1 = nixpkgs.lib.nixosSystem {
           inherit system;
           specialArgs = {
-            inherit inputs self sops-nix;
+            inherit inputs self;
           };
           modules = commonModules ++ [
             ./hosts/nats1
@@ -173,7 +167,7 @@
         vault01 = nixpkgs.lib.nixosSystem {
           inherit system;
           specialArgs = {
-            inherit inputs self sops-nix;
+            inherit inputs self;
           };
           modules = commonModules ++ [
             ./hosts/vault01
@@ -182,7 +176,7 @@
         testvm01 = nixpkgs.lib.nixosSystem {
           inherit system;
           specialArgs = {
-            inherit inputs self sops-nix;
+            inherit inputs self;
           };
           modules = commonModules ++ [
             ./hosts/testvm01
@@ -191,7 +185,7 @@
         testvm02 = nixpkgs.lib.nixosSystem {
           inherit system;
           specialArgs = {
-            inherit inputs self sops-nix;
+            inherit inputs self;
           };
           modules = commonModules ++ [
             ./hosts/testvm02
@@ -200,7 +194,7 @@
         testvm03 = nixpkgs.lib.nixosSystem {
           inherit system;
           specialArgs = {
-            inherit inputs self sops-nix;
+            inherit inputs self;
           };
           modules = commonModules ++ [
             ./hosts/testvm03