feat(chat): expose model options config

src/config.ts

@@ -1,6 +1,12 @@
 import dotenv from "dotenv";
 import { z } from "zod";
 
+import {
+  defaultAgentModelOptionsJson,
+  getAgentModelIds,
+  parseAgentModelOptions,
+} from "./chat/modelConfig.js";
+
 // 本地开发可在项目根目录放 .local.env；已存在的系统环境变量优先级更高。
 dotenv.config({ path: ".local.env", override: false });
 
@@ -45,6 +51,8 @@ const envSchema = z
     OPENCODE_TIMEOUT_MS: z.coerce.number().int().positive().default(5000),
     // 默认使用的 opencode 模型标识。
     OPENCODE_MODEL: z.string().default("deepseek/deepseek-v4-flash"),
+    // 聊天 UI 和 /stream 允许选择的 opencode 模型完整配置，JSON 数组。
+    OPENCODE_MODEL_OPTIONS: z.string().default(defaultAgentModelOptionsJson),
     // opencode skills 树目录；会在运行时解析为绝对路径，避免工具 cwd 偏移。
     OPENCODE_SKILLS_ROOT_DIR: z.string().default("./.opencode/skills"),
     // client 模式下，目标 opencode server 的基础地址。
@@ -116,6 +124,32 @@ const envSchema = z
         message: "OPENCODE_CLIENT_BASE_URL is required when OPENCODE_MODE=client",
       });
     }
+    let modelOptions;
+    try {
+      modelOptions = parseAgentModelOptions(env.OPENCODE_MODEL_OPTIONS);
+    } catch (error) {
+      ctx.addIssue({
+        code: z.ZodIssueCode.custom,
+        path: ["OPENCODE_MODEL_OPTIONS"],
+        message: error instanceof Error ? error.message : String(error),
+      });
+      return;
+    }
+    const supportedModels = getAgentModelIds(modelOptions);
+    if (supportedModels.length === 0) {
+      ctx.addIssue({
+        code: z.ZodIssueCode.custom,
+        path: ["OPENCODE_MODEL_OPTIONS"],
+        message: "OPENCODE_MODEL_OPTIONS must include at least one model",
+      });
+    }
+    if (!supportedModels.includes(env.OPENCODE_MODEL)) {
+      ctx.addIssue({
+        code: z.ZodIssueCode.custom,
+        path: ["OPENCODE_MODEL"],
+        message: "OPENCODE_MODEL must be included in OPENCODE_MODEL_OPTIONS",
+      });
+    }
   });
 
 export type AppConfig = z.infer<typeof envSchema>;