feat: improve host log management

[ssongliu]

Refs #13229

[Copilot]

Pull request overview

This PR adds support for clearing host SSH login logs from the UI by introducing a new /hosts/ssh/log/clean endpoint in the agent, wiring it into routing, and updating the frontend SSH log page to trigger the operation with confirmation. It also refines system log pagination for journalctl by introducing cursor-based pagination and adjusts time formatting for broader journalctl compatibility.

Changes:

• Add “Clean logs” action to the SSH login log view with confirmation and success feedback.
• Add agent API/route/service support to clear SSH log files and update Swagger/x-panel-log docs for the new endpoint.
• Improve system log (journalctl) pagination using __CURSOR and adjust journal time formatting.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
frontend/src/views/host/ssh/log/log.vue	Adds a confirmation-driven “clean logs” UI action for SSH login logs.
frontend/src/api/modules/host.ts	Adds a frontend API wrapper for /hosts/ssh/log/clean.
core/cmd/server/docs/x-log.json	Documents the new clean endpoint in panel log metadata.
core/cmd/server/docs/swagger.json	Adds Swagger path entry for /hosts/ssh/log/clean.
core/cmd/server/docs/docs.go	Updates embedded Swagger template to include the new endpoint.
agent/router/ro_host.go	Registers the new agent route /hosts/ssh/log/clean.
agent/cmd/server/docs/x-log.json	Documents the new clean endpoint in agent log metadata.
agent/app/service/ssh.go	Implements SSH log file detection improvements and adds log-cleaning behavior.
agent/app/service/logs.go	Adds cursor-based pagination support for journalctl and adjusts query time formatting.
agent/app/dto/logs.go	Extends system log DTO to carry the journal cursor internally.
agent/app/api/v2/ssh.go	Exposes the new CleanSSHLogs API endpoint.

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