fix(upgrade): 修复 upgrade 命令两个问题

1. npm/pnpm/bun 升级路径改为报错并提示使用 curl 方式，
   避免误装 kilocode 包（czcode 未发布到 npm registry）
2. 为 upgrade 命令添加 update alias，修复 ./czcode update
   被 yargs 误解析为 run 命令的 message 参数导致 chdir 报错

Author: yunqiqiliang

packages/opencode/src/cli/cmd/upgrade.ts

@@ -6,6 +6,7 @@ import { InstallationVersion } from "@opencode-ai/core/installation/version"
 
 export const UpgradeCommand = {
   command: "upgrade [target]",
+  aliases: ["update"], // czcode_change - alias 'update' to 'upgrade'
   describe: "upgrade czcode to the latest or a specific version", // czcode_change
   builder: (yargs: Argv) => {
     return yargs

packages/opencode/src/installation/index.ts

@@ -284,15 +284,14 @@ export const layer: Layer.Layer<Service, never, HttpClient.HttpClient | ChildPro
             case "curl":
               upgradeResult = yield* upgradeCurl(target)
               break
+            // czcode_change start - npm/pnpm/bun not supported, redirect to curl
             case "npm":
-              upgradeResult = yield* run(["npm", "install", "-g", `@kilocode/cli@${target}`]) // kilocode_change
-              break
             case "pnpm":
-              upgradeResult = yield* run(["pnpm", "install", "-g", `@kilocode/cli@${target}`]) // kilocode_change
-              break
             case "bun":
-              upgradeResult = yield* run(["bun", "install", "-g", `@kilocode/cli@${target}`]) // kilocode_change
-              break
+              return yield* new UpgradeFailedError({
+                stderr: `czcode 不支持通过 ${m} 升级。\n请使用 curl 方式重新安装最新版本：\nhttps://github.com/clickzetta/czcode/releases`,
+              })
+            // czcode_change end
             case "brew": {
               const formula = yield* getBrewFormula()
               const env = { HOMEBREW_NO_AUTO_UPDATE: "1" }