Split runtime node_modules into reusable layers

- Add shared installFlags support to the common Bun node_modules builder
- Factor base and desktop overlay node_modules derivations for reuse
- Reuse the new runtime node_modules outputs in desktop and server builds

packages/t3code-server/default.nix

@@ -44,6 +44,24 @@ in
       ];
     };
 
+    runtimeNodeModules = common.mkNodeModules {
+      inherit (finalAttrs) pname version src;
+      outputHash = "sha256-EcUsCt8liYnmzsDXzdwfLbMEk4/OYHB6DkcjjvmTWEM=";
+      installFlags = [
+        "--production"
+      ];
+      filters = [
+        "."
+        "./apps/server"
+        "./apps/web"
+        "./packages/client-runtime"
+        "./packages/contracts"
+        "./packages/effect-acp"
+        "./packages/effect-codex-app-server"
+        "./packages/shared"
+      ];
+    };
+
     nativeBuildInputs = [
       bun
       makeBinaryWrapper
@@ -76,7 +94,10 @@ in
       mkdir -p "$out/libexec/t3code/apps"
       mkdir -p "$out/libexec/t3code/packages"
 
-      cp -R --no-preserve=mode node_modules "$out/libexec/t3code/"
+      cp -R --no-preserve=mode ${finalAttrs.runtimeNodeModules} "$out/libexec/t3code/node_modules"
+      chmod -R u+rwX "$out/libexec/t3code/node_modules"
+      rm -rf "$out/libexec/t3code/node_modules/node-pty"
+      cp -R --no-preserve=mode node_modules/node-pty "$out/libexec/t3code/node_modules/"
       cp -R --no-preserve=mode apps/server/dist "$out/libexec/t3code/apps/server/"
       cp -R --no-preserve=mode apps/web "$out/libexec/t3code/apps/"
       cp -R --no-preserve=mode packages/client-runtime "$out/libexec/t3code/packages/"