opencode: use models-dev package instead of fetching from online api

- Added `models-dev` to `nativeBuildInputs`.
- Removed the old patch that fetched data from a remote URL and
  introduced a new patch to read from a local file if a path is provided
  via the `MODELS_DEV_API_JSON` environment variable.

pkgs/by-name/op/opencode/fix-models-macro.patch

@@ -1,8 +0,0 @@
---- a/packages/opencode/src/provider/models-macro.ts
-+++ b/packages/opencode/src/provider/models-macro.ts
-@@ -1,4 +1,3 @@
- export async function data() {
--  const json = await fetch("https://models.dev/api.json").then((x) => x.text())
--  return json
-+  return process.env.MODELS_JSON || '{}';
- }

pkgs/by-name/op/opencode/local-models-dev.patch

@@ -0,0 +1,20 @@
+diff --git i/packages/opencode/src/provider/models-macro.ts w/packages/opencode/src/provider/models-macro.ts
+index 91a0348..4f60069 100644
+--- i/packages/opencode/src/provider/models-macro.ts
++++ w/packages/opencode/src/provider/models-macro.ts
+@@ -1,4 +1,15 @@
+ export async function data() {
++  const localApiJsonPath = process.env.MODELS_DEV_API_JSON
++  
++  // Try to read from local file if path is provided
++  if (localApiJsonPath) {
++    const localFile = Bun.file(localApiJsonPath)
++    if (await localFile.exists()) {
++      return await localFile.text()
++    }
++  }
++  
++  // Fallback to fetching from remote URL
+   const json = await fetch("https://models.dev/api.json").then((x) => x.text())
+   return json
+ }

pkgs/by-name/op/opencode/package.nix

@@ -4,7 +4,7 @@
   buildGoModule,
   bun,
   fetchFromGitHub,
-  fetchurl,
+  models-dev,
   nix-update-script,
   testers,
   writableTmpDirAsHomeHook,
@@ -106,17 +106,15 @@ stdenvNoCC.mkDerivation (finalAttrs: {
     outputHashMode = "recursive";
   };
 
-  models-dev-data = fetchurl {
+  nativeBuildInputs = [
-    url = "https://models.dev/api.json";
+    bun
-    sha256 = "sha256-igxQOC+Hz2FnXIW/S4Px9WhRuBhcIQIHO+7U8jHU1TQ=";
+    models-dev
-  };
+  ];
-
-  nativeBuildInputs = [ bun ];
 
   patches = [
-    # Patch `packages/opencode/src/provider/models-macro.ts` to load the prefetched `models.dev/api.json`
+    # Patch `packages/opencode/src/provider/models-macro.ts` to get contents of
-    # from the `MODELS_JSON` environment variable instead of fetching it at build time.
+    # `api.json` from the file bundled with `bun build`.
-    ./fix-models-macro.patch
+    ./local-models-dev.patch
   ];
 
   configurePhase = ''
@@ -127,10 +125,11 @@ stdenvNoCC.mkDerivation (finalAttrs: {
     runHook postConfigure
   '';
 
+  env.MODELS_DEV_API_JSON = "${models-dev}/dist/api.json";
+
   buildPhase = ''
     runHook preBuild
 
-    export MODELS_JSON="$(cat ${finalAttrs.models-dev-data})"
     bun build \
       --define OPENCODE_VERSION="'${finalAttrs.version}'" \
       --compile \