fix: separate Anthropic output and context limits

Direct Anthropic connections reused the configured context window as max_tokens, which could impose an unintended output value or send a provider-invalid request. Anthropic connections now expose an independent per-response maximum output setting, defaulting to 32K for the protocol-required field, while OpenAI direct requests remain without an added output token cap and direct tool rounds remain unmetered.

Release note: Anthropic 直连模型现在可单独配置单次最大输出，不再复用上下文窗口；OpenAI 直连请求和工具调用轮次不增加额外配额。

src/renderer/src/SettingsPanel.test.tsx

@@ -1112,6 +1112,10 @@ describe('SettingsPanel runtime files', () => {
     expect(contextWindow).toHaveValue(null)
     expect(contextWindow).toHaveAttribute('min', '32')
     fireEvent.change(contextWindow, { target: { value: '256' } })
+    const maximumOutput = screen.getByLabelText('Anthropic 最大输出')
+    expect(maximumOutput).toHaveValue(32)
+    expect(maximumOutput).toHaveAttribute('min', '1')
+    fireEvent.change(maximumOutput, { target: { value: '48' } })
     fireEvent.click(screen.getByRole('button', { name: '保存设置' }))
 
     await waitFor(() =>
@@ -1120,7 +1124,8 @@ describe('SettingsPanel runtime files', () => {
           modelProfiles: expect.arrayContaining([
             expect.objectContaining({
               id: modelProfileId,
-              contextWindowTokens: 256_000
+              contextWindowTokens: 256_000,
+              maximumOutputTokens: 48_000
             })
           ])
         })

src/renderer/src/SettingsPanel.tsx

@@ -34,6 +34,7 @@ import type {
 } from '../../shared/contracts'
 import {
   defaultContextCompressionSettings,
+  defaultAnthropicMaximumOutputTokens,
   builtinEmbeddingConnectionId,
   defaultModelProfileId as builtInDefaultModelProfileId,
   defaultRuntimeSettings,
@@ -257,6 +258,9 @@ function toModelProfileDrafts(
   return settings.modelProfiles.map((profile) => ({
     ...profile,
     supportsImageInput: profile.supportsImageInput ?? false,
+    maximumOutputTokens:
+      profile.maximumOutputTokens ??
+      defaultAnthropicMaximumOutputTokens,
     apiKey: '',
     clearApiKey: false
   }))
@@ -1285,6 +1289,7 @@ export function SettingsPanel({
           authentication: profile.authentication,
           supportsImageInput: profile.supportsImageInput,
           contextWindowTokens: profile.contextWindowTokens,
+          maximumOutputTokens: profile.maximumOutputTokens,
           imageGenerationQuality: profile.imageGenerationQuality,
           apiKey: profile.clearApiKey
             ? ({ action: 'clear' } as const)
@@ -1670,6 +1675,7 @@ export function SettingsPanel({
         protocol: 'openai-chat-completions',
         authentication: defaultRuntimeSettings.modelAuthentication,
         supportsImageInput: defaultRuntimeSettings.supportsImageInput,
+        maximumOutputTokens: defaultAnthropicMaximumOutputTokens,
         imageGenerationQuality:
           defaultRuntimeSettings.imageGenerationQuality,
         apiKeyConfigured: false,
@@ -3136,6 +3142,34 @@ export function SettingsPanel({
                           {t('model.profile.contextWindowDescription')}
                         </small>
                       </label>
+                      {profile.protocol === 'anthropic-messages' && (
+                        <label className="field">
+                          <span>{t('model.profile.maximumOutput')}</span>
+                          <input
+                            aria-label={t('model.profile.maximumOutput')}
+                            inputMode="numeric"
+                            max={10_000}
+                            min={1}
+                            onChange={(event) => {
+                              const value = event.target.valueAsNumber
+                              updateModelProfile(profile.id, {
+                                maximumOutputTokens: Number.isFinite(value)
+                                  ? Math.round(value * 1_000)
+                                  : defaultAnthropicMaximumOutputTokens
+                              })
+                            }}
+                            placeholder="32"
+                            type="number"
+                            value={
+                              (profile.maximumOutputTokens ??
+                                defaultAnthropicMaximumOutputTokens) / 1_000
+                            }
+                          />
+                          <small>
+                            {t('model.profile.maximumOutputDescription')}
+                          </small>
+                        </label>
+                      )}
                     </>
                   )}
                   {profile.protocol ===

src/renderer/src/i18n/locales/en-US/settings.ts

@@ -721,6 +721,9 @@ export const settings = {
       contextWindow: 'Context window (optional)',
       contextWindowDescription:
         'Enter 32K–10000K tokens. Leave blank when unknown. This value is used only for GoodBuddy local budget calculations.',
+      maximumOutput: 'Anthropic maximum output',
+      maximumOutputDescription:
+        'The Anthropic Messages protocol requires this value on every request. Enter 1K–10000K tokens. It limits only one model response, not tool rounds or cumulative usage.',
       imageQuality: 'Image quality',
       imageQualityAriaLabel: 'Image quality for {{name}}',
       quality: {

src/renderer/src/i18n/locales/zh-CN/settings.ts

@@ -662,6 +662,9 @@ export const settings = {
       contextWindow: '上下文上限（可选）',
       contextWindowDescription:
         '以 K tokens 填写，范围为 32K–10000K。留空表示未知；此值仅用于 GoodBuddy 本地预算计算。',
+      maximumOutput: 'Anthropic 最大输出',
+      maximumOutputDescription:
+        'Anthropic Messages 协议要求每次请求提供该值。填写 1K–10000K tokens；它只限制单次模型响应，不限制工具调用轮次或累计用量。',
       imageQuality: '图片质量',
       imageQualityAriaLabel: '图片质量 {{name}}',
       quality: {