fix: increase proxy stream timeout from 30s to 10min

The 30-second AbortSignal.timeout on streaming fetch requests was
causing long-running tool calls (file editing, code search) to be
silently killed. The UI would show the task as still running but
no data was flowing, making it appear stuck indefinitely.

- Increase fetch timeout to 600s (10 min) for both stream and
  non-stream requests
- Add 5-minute per-chunk timeout in both stream parsers so a
  truly dead upstream is detected and surfaced as an error
  instead of hanging forever

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

cc-haha/src/server/proxy/handler.ts

@@ -119,7 +119,7 @@ async function handleOpenaiChat(
       Authorization: `Bearer ${apiKey}`,
     },
     body: JSON.stringify(transformed),
-    signal: isStream ? AbortSignal.timeout(30_000) : AbortSignal.timeout(300_000),
+    signal: AbortSignal.timeout(600_000),
   })
 
   if (!upstream.ok) {
@@ -176,7 +176,7 @@ async function handleOpenaiResponses(
       Authorization: `Bearer ${apiKey}`,
     },
     body: JSON.stringify(transformed),
-    signal: isStream ? AbortSignal.timeout(30_000) : AbortSignal.timeout(300_000),
+    signal: AbortSignal.timeout(600_000),
   })
 
   if (!upstream.ok) {

cc-haha/src/server/proxy/streaming/openaiChatStreamToAnthropic.ts

@@ -105,7 +105,13 @@ export function openaiChatStreamToAnthropic(
 
       try {
         while (true) {
-          const { done, value } = await reader.read()
+          const readResult = await Promise.race([
+            reader.read(),
+            new Promise<never>((_, reject) =>
+              setTimeout(() => reject(new Error('Stream chunk timeout: no data for 5 minutes')), 300_000)
+            ),
+          ])
+          const { done, value } = readResult
           if (done) break
 
           buffer += decoder.decode(value, { stream: true })

cc-haha/src/server/proxy/streaming/openaiResponsesStreamToAnthropic.ts

@@ -44,7 +44,13 @@ export function openaiResponsesStreamToAnthropic(
 
       try {
         while (true) {
-          const { done, value } = await reader.read()
+          const readResult = await Promise.race([
+            reader.read(),
+            new Promise<never>((_, reject) =>
+              setTimeout(() => reject(new Error('Stream chunk timeout: no data for 5 minutes')), 300_000)
+            ),
+          ])
+          const { done, value } = readResult
           if (done) break
 
           buffer += decoder.decode(value, { stream: true })