Add global SSH key configuration in system settings (#2840)

* Initial plan

* Add backend support for global SSH keys

Co-authored-by: whyour <22700758+whyour@users.noreply.github.com>

* Add frontend UI for global SSH keys management

Co-authored-by: whyour <22700758+whyour@users.noreply.github.com>

* Add SshKeyModel to database initialization

Co-authored-by: whyour <22700758+whyour@users.noreply.github.com>

* Add SSH config generation for global SSH keys

Co-authored-by: whyour <22700758+whyour@users.noreply.github.com>

* Add internationalization support for SSH key management UI

Co-authored-by: whyour <22700758+whyour@users.noreply.github.com>

* Simplify to single global SSH key in system settings

Co-authored-by: whyour <22700758+whyour@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: whyour <22700758+whyour@users.noreply.github.com>

src/locales/en-US.json

@@ -104,7 +104,7 @@
   "序号": "Number",
   "备注": "Remarks",
   "更新时间": "Update Time",
-  "创建时间": "Creation Time",
+  "创建时间": "Created Time",
   "确认删除依赖": "Confirm to delete the dependency",
   "确认重新安装": "Confirm to reinstall",
   "确认取消安装": "Confirm to cancel install",
@@ -252,7 +252,7 @@
   "登录日志": "Login Logs",
   "其他设置": "Other Settings",
   "关于": "About",
-  "成功": "Success",
+  "成功": "Successfully",
   "失败": "Failure",
   "登录时间": "Login Time",
   "登录地址": "Login Address",
@@ -538,5 +538,19 @@
   "单实例模式：定时启动新任务前会自动停止旧任务；多实例模式：允许同时运行多个任务实例": "Single instance mode: automatically stop old task before starting new scheduled task; Multi-instance mode: allow multiple task instances to run simultaneously",
   "请选择实例模式": "Please select instance mode",
   "单实例": "Single Instance",
-  "多实例": "Multi-Instance"
+  "多实例": "Multi-Instance",
+  "SSH密钥": "SSH Keys",
+  "别名": "Alias",
+  "编辑SSH密钥": "Edit SSH Key",
+  "创建SSH密钥": "Create SSH Key",
+  "更新SSH密钥成功": "SSH key updated successfully",
+  "创建SSH密钥成功": "SSH key created successfully",
+  "请输入SSH密钥别名": "Please enter SSH key alias",
+  "请输入SSH私钥": "Please enter SSH private key",
+  "请输入SSH私钥内容（以 -----BEGIN 开头）": "Please enter SSH private key content (starts with -----BEGIN)",
+  "确认删除SSH密钥": "Confirm to delete SSH key",
+  "批量": "Batch",
+  "全局SSH私钥": "Global SSH Private Key",
+  "用于访问所有私有仓库的全局SSH私钥": "Global SSH private key for accessing all private repositories",
+  "请输入完整的SSH私钥内容": "Please enter the complete SSH private key content"
 }