Refactored the journalctl API to accept `node`, `vmid`, and `service` parameters as query strings in addition to path parameters. Added a new route `/proxmox/journalctl` that accepts all parameters via query string while maintaining backward compatibility with existing path-parameter routes.
- Changed `JournalctlRequest` struct binding from URI-only to query+URI
- Simplified Swagger documentation by consolidating multiple route definitions
- Existing path-parameter routes remain functional for backward compatibility
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