fix(opencode): fix free tier 403 error and improve China region handling

- Force stream:true and cloak decoy tools (bash, read) for OpenCode free tier
- Support connection testing for opencode in testUtils
- Expand error message slice limits in auth and ping to preserve workspace link
- Add concise China region link chip in provider detail page

Co-Authored-By: Claude Code <noreply@anthropic.com>

src/app/(dashboard)/dashboard/providers/[id]/page.js

@@ -1783,7 +1783,33 @@ export default function ProviderDetailPage() {
           })()}
         </div>
         {!!modelsTestError && (
-          <p className="text-xs text-red-500 mb-3 break-words">{modelsTestError}</p>
+          <div className="mb-3">
+            <p className="text-xs text-red-500 break-words">{modelsTestError}</p>
+            {/RegionError|hosted in China|regionNotAllowed/i.test(modelsTestError) && (() => {
+              const str = typeof modelsTestError === "string" ? modelsTestError : JSON.stringify(modelsTestError);
+              const linkMatch = str.match(/https:\/\/opencode\.ai\/workspace\/[^\s"')]+/);
+              const wrkMatch = str.match(/wrk_[0-9A-Za-z]+/);
+              const targetUrl = linkMatch
+                ? (linkMatch[0].endsWith("/go") ? linkMatch[0] : `${linkMatch[0]}/go`)
+                : wrkMatch
+                  ? `https://opencode.ai/workspace/${wrkMatch[0]}/go`
+                  : "https://opencode.ai";
+
+              return (
+                <div className="mt-1.5">
+                  <a
+                    href={targetUrl}
+                    target="_blank"
+                    rel="noreferrer"
+                    className="inline-flex items-center gap-1 rounded-md bg-amber-500/10 px-2 py-0.5 text-xs font-medium text-amber-600 hover:bg-amber-500/20 dark:text-amber-400 transition-colors"
+                  >
+                    <span>Allow China-hosted models</span>
+                    <span className="material-symbols-outlined text-[13px]">open_in_new</span>
+                  </a>
+                </div>
+              );
+            })()}
+          </div>
         )}
         {providerId === "zed" && !!liveModelsError && (
           <p className="text-xs text-red-500 mb-3 break-words">{liveModelsError}</p>

src/app/api/models/test/ping.js

@@ -160,7 +160,7 @@ export async function pingModelByKind(model, kind, baseUrl = `http://127.0.0.1:$
 
   if (!res.ok) {
     const detail = parsed?.error?.message || parsed?.msg || parsed?.message || parsed?.error || rawText;
-    return { ok: false, latencyMs, error: `HTTP ${res.status}${detail ? `: ${String(detail).slice(0, 240)}` : ""}`, status: res.status };
+    return { ok: false, latencyMs, error: `HTTP ${res.status}${detail ? `: ${String(detail).slice(0, 500)}` : ""}`, status: res.status };
   }
 
   const providerStatus = parsed?.status;

src/app/api/providers/[id]/test/testUtils.js

@@ -751,6 +751,12 @@ async function testApiKeyConnection(connection, effectiveProxy = null) {
         const valid = !!(data && data.user);
         return { valid, error: valid ? null : "Session expired — re-paste cookie" };
       }
+      case "opencode": {
+        const res = await fetchWithConnectionProxy("https://opencode.ai/zen/v1/models", {
+          headers: { Authorization: "Bearer public", "User-Agent": "opencode/1.18.31" },
+        }, effectiveProxy);
+        return { valid: res.ok, error: res.ok ? null : "OpenCode free tier unavailable" };
+      }
       case "opencode-go": {
         const res = await fetchWithConnectionProxy("https://opencode.ai/zen/go/v1/chat/completions", {
           method: "POST",

src/sse/services/auth.js

@@ -263,7 +263,7 @@ export async function markAccountUnavailable(connectionId, status, errorText, pr
   }
   if (!shouldFallback) return { shouldFallback: false, cooldownMs: 0 };
 
-  const reason = typeof errorText === "string" ? errorText.slice(0, 100) : "Provider error";
+  const reason = typeof errorText === "string" ? errorText.slice(0, 200) : "Provider error";
   const lockUpdate = buildModelLockUpdate(githubResetAtMs ? null : model, cooldownMs);
 
   await updateProviderConnection(connectionId, {