fix(review): import-first in proxy.ts, drop duplicate EXTERNAL_* comments in .env.example

Author: samson910022

.env.example

@@ -36,9 +36,6 @@ OPENCODE_PROXY_CLEANUP_MAX_AGE_MS=86400000
 # OPENCODE_PROXY_DEBUG=false
 # OPENCODE_PATH=opencode
 # OPENCODE_ZEN_API_KEY=
-# External bridge (fixed values today; passed through by compose)
-# OPENCODE_EXTERNAL_TOOLS_MODE=proxy-bridge
-# OPENCODE_EXTERNAL_TOOLS_CONFLICT_POLICY=namespace
 # Internal allowlist (only applies when a request carries no tools)
 # OPENCODE_INTERNAL_WEB_FETCH_ENABLED=false
 # OPENCODE_INTERNAL_ALLOWED_TOOLS=

src/proxy.ts

@@ -40,13 +40,12 @@ import type {
 } from './types/context.js';
 import type { ProxyClient, ProviderInfo, ModelInfo, ResolvedModel } from './types/client.js';
 import type { ResponseStateEntry } from './types/backend.js';
+import { asRecord, toErrorMessage } from './utils/guards.js';
 
 // P4: thin re-exports to preserve original import paths
 // (tests/env-alias.test.js, stream-hardening.test.js import these from '../src/proxy.js').
 export { normalizeBool, resolveDisableTools, withTimeout };
 
-import { asRecord, toErrorMessage } from './utils/guards.js';
-
 export function createApp(config: ProxyConfig): CreateAppResult {
   const {
     API_KEY,