fix(go-models): use per call context timeouts so long streaming responses are not truncated (#15380)

### What problem does this PR solve?

Closes #15379 

Around 29 Go model providers in `internal/entity/models/` share an
`http.Client` configured with `Timeout: 120 * time.Second`, and reuse
that same client for `ChatStreamlyWithSender`. Go's
`http.Client.Timeout` is a hard ceiling on the whole request that also
covers reading the response body, so it behaves as a wall clock on
streaming. Any streamed chat response that lasts longer than 120 seconds
gets cut off in the middle with a timeout error. Long generations,
reasoning model outputs, and slow or overloaded upstreams are the common
victims.

The providers that already behave correctly (`groq`, `mistral`,
`voyage`, `anthropic`) set no client `Timeout` and instead wrap each
request in a `context.WithTimeout`. This change converges the affected
providers onto that same pattern.

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

---------

Co-authored-by: Jin Hai <haijin.chn@gmail.com>

web/src/locales/zh.ts

@@ -1101,8 +1101,10 @@ NER：使用 spaCy NER 和基于规则的关键词提取来抽取实体和关系
       dropboxDescription: '连接 Dropbox，同步指定账号下的文件与文件夹。',
       onedriveDescription:
         '连接 OneDrive 或 OneDrive for Business，通过 Microsoft Graph delta 查询索引文件和文件夹。',
-      onedriveTenantIdTip: 'Microsoft 365 组织的 Azure Active Directory 租户 ID（目录 ID）。',
-      onedriveClientIdTip: '拥有 Files.Read.All 权限的 Azure AD 应用注册的应用程序（客户端）ID。',
+      onedriveTenantIdTip:
+        'Microsoft 365 组织的 Azure Active Directory 租户 ID（目录 ID）。',
+      onedriveClientIdTip:
+        '拥有 Files.Read.All 权限的 Azure AD 应用注册的应用程序（客户端）ID。',
       onedriveClientSecretTip: '在 Azure AD 应用注册中生成的客户端密钥值。',
       onedriveFolderPathTip:
         '可选的子文件夹路径，用于限制索引范围（例如 /Documents/Reports）。留空则索引整个云盘。',