add optional headers field to model config (#3546)

packages/opencode/src/provider/models.ts

@@ -37,6 +37,7 @@ export namespace ModelsDev {
       experimental: z.boolean().optional(),
       status: z.enum(["alpha", "beta"]).optional(),
       options: z.record(z.string(), z.any()),
+      headers: z.record(z.string(), z.string()).optional(),
       provider: z.object({ npm: z.string() }).optional(),
     })
     .meta({

packages/opencode/src/provider/provider.ts

@@ -306,6 +306,7 @@ export namespace Provider {
               input: ["text"],
               output: ["text"],
             },
+          headers: model.headers,
           provider: model.provider ?? existing?.provider,
         }
         if (model.id && model.id !== modelID) {