refactor(proxy): remove OpenRouter fallback, simplify to Anthropic API + CLI

Removes all OpenRouter proxy code from claude-proxy.ts. The fallback
chain is now just: Anthropic API (key/OAuth) → Claude CLI.

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

packages/app/server/claude-proxy.ts

@@ -176,7 +176,6 @@ async function getAnthropicCredential(): Promise<string | undefined> {
   return undefined
 }
 
-const OPENROUTER_API_KEY = process.env.OPENROUTER_API_KEY ?? process.env.VITE_OPENROUTER_API_KEY ?? ''
 const isOAuthToken = (s: string) => /^sk-ant-oat/.test(s)
 
 const SEARCH_WEB_TOOL = {
@@ -326,176 +325,6 @@ async function streamViaAnthropicApi(
   }
 }
 
-/** Call OpenRouter but emit Anthropic-format SSE (for Claude provider fallback) */
-async function streamViaOpenRouterFallback(
-  model: string,
-  system: string | undefined,
-  messages: { role: string; content: string }[],
-  res: import('http').ServerResponse,
-): Promise<void> {
-  const orModel = model?.includes('opus') ? 'anthropic/claude-opus-4'
-    : model?.includes('haiku') ? 'anthropic/claude-haiku-4'
-    : 'anthropic/claude-sonnet-4'
-  const orMessages: { role: string; content: string }[] = []
-  if (system) orMessages.push({ role: 'system', content: system })
-  for (const m of messages) {
-    orMessages.push({ role: m.role, content: m.content })
-  }
-
-  let clientDisconnected = false
-  res.on('close', () => { clientDisconnected = true })
-
-  res.writeHead(200, {
-    'Content-Type': 'text/event-stream',
-    'Cache-Control': 'no-cache',
-    'Connection': 'keep-alive',
-    'Access-Control-Allow-Origin': '*',
-    'X-Accel-Buffering': 'no',
-  })
-
-  try {
-    const apiRes = await fetch('https://openrouter.ai/api/v1/chat/completions', {
-      method: 'POST',
-      headers: {
-        'Content-Type': 'application/json',
-        'Authorization': `Bearer ${OPENROUTER_API_KEY}`,
-        'HTTP-Referer': APP_URL,
-        'X-Title': 'AIUI',
-      },
-      body: JSON.stringify({ model: orModel, messages: orMessages, stream: true }),
-      signal: AbortSignal.timeout(120000),
-    })
-
-    if (!apiRes.ok) {
-      const errBody = await apiRes.text()
-      if (!clientDisconnected) {
-        res.write(`data: ${JSON.stringify({ type: 'error', error: { message: `OpenRouter ${apiRes.status}: ${errBody.slice(0, 200)}` } })}\n\n`)
-        res.write('data: [DONE]\n\n')
-        res.end()
-      }
-      return
-    }
-
-    const reader = apiRes.body?.getReader()
-    if (!reader) {
-      if (!clientDisconnected) {
-        res.write('data: [DONE]\n\n')
-        res.end()
-      }
-      return
-    }
-
-    const decoder = new TextDecoder()
-    let buffer = ''
-    while (true) {
-      const { done, value } = await reader.read()
-      if (done || clientDisconnected) break
-      buffer += decoder.decode(value, { stream: true })
-      const lines = buffer.split('\n')
-      buffer = lines.pop() ?? ''
-      for (const line of lines) {
-        if (!line.startsWith('data: ')) continue
-        const payload = line.slice(6).trim()
-        if (payload === '[DONE]') continue
-        try {
-          const chunk = JSON.parse(payload)
-          const text = chunk.choices?.[0]?.delta?.content
-          if (text && !clientDisconnected) {
-            // Convert to Anthropic SSE format
-            res.write(`data: ${JSON.stringify({ type: 'content_block_delta', delta: { type: 'text_delta', text } })}\n\n`)
-          }
-        } catch { /* skip malformed chunks */ }
-      }
-    }
-
-    if (!clientDisconnected) {
-      res.write('data: [DONE]\n\n')
-      res.end()
-    }
-  } catch (err) {
-    console.error('[proxy] OpenRouter fallback error:', err)
-    if (!clientDisconnected) {
-      res.write(`data: ${JSON.stringify({ type: 'error', error: { message: `OpenRouter error: ${err instanceof Error ? err.message : String(err)}` } })}\n\n`)
-      res.write('data: [DONE]\n\n')
-      res.end()
-    }
-  }
-}
-
-async function streamOpenRouterProxy(
-  reqBody: string,
-  res: import('http').ServerResponse,
-): Promise<void> {
-  if (!OPENROUTER_API_KEY) {
-    res.writeHead(500, { 'Content-Type': 'application/json', 'Access-Control-Allow-Origin': '*' })
-    res.end(JSON.stringify({ error: 'OPENROUTER_API_KEY not configured on server' }))
-    return
-  }
-
-  res.writeHead(200, {
-    'Content-Type': 'text/event-stream',
-    'Cache-Control': 'no-cache',
-    'Connection': 'keep-alive',
-    'Access-Control-Allow-Origin': '*',
-    'X-Accel-Buffering': 'no',
-  })
-
-  let clientDisconnected = false
-  res.on('close', () => { clientDisconnected = true })
-
-  try {
-    const apiRes = await fetch('https://openrouter.ai/api/v1/chat/completions', {
-      method: 'POST',
-      headers: {
-        'Content-Type': 'application/json',
-        'Authorization': `Bearer ${OPENROUTER_API_KEY}`,
-        'HTTP-Referer': APP_URL,
-        'X-Title': 'AIUI',
-      },
-      body: reqBody,
-      signal: AbortSignal.timeout(120000),
-    })
-
-    if (!apiRes.ok) {
-      const errBody = await apiRes.text()
-      if (!clientDisconnected) {
-        res.write(`data: ${JSON.stringify({ error: `OpenRouter API ${apiRes.status}: ${errBody.slice(0, 200)}` })}\n\n`)
-        res.write('data: [DONE]\n\n')
-        res.end()
-      }
-      return
-    }
-
-    const reader = apiRes.body?.getReader()
-    if (!reader) {
-      if (!clientDisconnected) {
-        res.write('data: [DONE]\n\n')
-        res.end()
-      }
-      return
-    }
-
-    const decoder = new TextDecoder()
-    while (true) {
-      const { done, value } = await reader.read()
-      if (done || clientDisconnected) break
-      const chunk = decoder.decode(value, { stream: true })
-      res.write(chunk)
-    }
-
-    if (!clientDisconnected) {
-      res.end()
-    }
-  } catch (err) {
-    console.error('[proxy] OpenRouter error:', err)
-    if (!clientDisconnected) {
-      res.write(`data: ${JSON.stringify({ error: `OpenRouter proxy error: ${err instanceof Error ? err.message : String(err)}` })}\n\n`)
-      res.write('data: [DONE]\n\n')
-      res.end()
-    }
-  }
-}
-
 const server = createServer((req, res) => {
   if (req.method === 'OPTIONS') {
     res.writeHead(204, {
@@ -507,7 +336,7 @@ const server = createServer((req, res) => {
     return
   }
 
-  if (req.method !== 'POST' || (req.url !== '/v1/messages' && req.url !== '/v1/openrouter')) {
+  if (req.method !== 'POST' || req.url !== '/v1/messages') {
     res.writeHead(404, { 'Content-Type': 'application/json' })
     res.end(JSON.stringify({ error: 'Not found' }))
     return
@@ -516,11 +345,6 @@ const server = createServer((req, res) => {
   let body = ''
   req.on('data', (chunk) => { body += chunk })
   req.on('end', async () => {
-    if (req.url === '/v1/openrouter') {
-      console.log('[proxy] → OpenRouter proxy')
-      streamOpenRouterProxy(body, res)
-      return
-    }
     try {
       const payload = JSON.parse(body)
       const { model, messages, system, webSearch } = payload
@@ -542,17 +366,8 @@ const server = createServer((req, res) => {
         return
       }
 
-      // Fallback: OpenRouter (when no Anthropic credential available)
-      if (OPENROUTER_API_KEY) {
-        console.log('[proxy] No API credential — falling back to OpenRouter')
-        const lastMsg = (messages ?? []).slice(-1)[0]?.content?.slice(0, 60) ?? ''
-        console.log(`[proxy] → OpenRouter fallback "${lastMsg}..."`)
-        await streamViaOpenRouterFallback(model, system, messages ?? [], res)
-        return
-      }
-
-      // Last resort: Claude CLI (works when logged in from terminal)
-      console.log('[proxy] No API credential and no OpenRouter key — falling back to Claude CLI')
+      // Fallback: Claude CLI (works when logged in from terminal)
+      console.log('[proxy] No API credential — falling back to Claude CLI')
 
       const modelFlag = model?.includes('opus') ? 'opus'
         : model?.includes('haiku') ? 'haiku'
@@ -615,7 +430,7 @@ const server = createServer((req, res) => {
         if (fullOutput.length === 0 && !clientDisconnected) {
           console.warn('[proxy] CLI timeout (30s no output) — killing process')
           proc.kill('SIGTERM')
-          res.write(`data: ${JSON.stringify({ type: 'error', error: { message: 'Claude CLI timed out. Set ANTHROPIC_API_KEY or VITE_OPENROUTER_API_KEY in .env.local' } })}\n\n`)
+          res.write(`data: ${JSON.stringify({ type: 'error', error: { message: 'Claude CLI timed out. Set ANTHROPIC_API_KEY in .env.local or log in with: claude login' } })}\n\n`)
           res.write('data: [DONE]\n\n')
           res.end()
         }
@@ -691,14 +506,10 @@ server.listen(PORT, async () => {
     const mode = isOAuthToken(credential) ? 'OAuth (Max)' : 'API key'
     console.log(`  Auth: ${mode} (token ...${credential.slice(-8)})`)
     console.log(`  Mode: Direct Anthropic API (no CLI needed)`)
-  } else if (OPENROUTER_API_KEY) {
-    console.log(`  Auth: none found (Anthropic)`)
-    console.log(`  Fallback: OpenRouter (key ...${OPENROUTER_API_KEY.slice(-8)})`)
   } else {
     console.log(`  Auth: none found`)
     console.log(`  Checked: env vars, ~/.claude/.credentials.json, ~/.claude/settings.json`)
     console.log(`  Fallback: Claude CLI (${CLAUDE_BIN})`)
   }
-  console.log(`  OpenRouter proxy: ${OPENROUTER_API_KEY ? 'enabled' : 'add OPENROUTER_API_KEY to .env.local'}`)
   console.log()
 })