feat: add ssh.nix with matchBlocks, pass origins (forgejo+github+solmoe)

home/ssh.nix

@@ -0,0 +1,32 @@
+{ ... }:
+{
+  # SSH client configuration with host-specific keys
+  programs.ssh = {
+    enable = true;
+    
+    matchBlocks = {
+      # Forgejo (personal) — port 2222
+      "git.iscg.dev" = {
+        identityFile = "~/.ssh/id_ed25519_forgejo";
+        port = 2222;
+        identitiesOnly = true;
+        addKeysToAgent = "yes";
+      };
+      
+      # GitHub
+      "github.com" = {
+        identityFile = "~/.ssh/id_ed25519";
+        identitiesOnly = true;
+        addKeysToAgent = "yes";
+      };
+      
+      # git.sol.moe
+      "git.sol.moe" = {
+        identityFile = "~/.ssh/poppy";
+        user = "mikl";
+        identitiesOnly = true;
+        addKeysToAgent = "yes";
+      };
+    };
+  };
+}