Refactor API endpoint construction and add ID validation

[arslanbekov]

Description

• Replaced direct string formatting for API endpoints with a new buildURL function for consistency and readability across multiple services.
• Introduced validateID checks in various service methods to ensure that IDs are valid before making API requests, enhancing error handling and robustness.
• Updated methods in HostApplicationsService, HostConnectorsService, HostIPServicesService, HostRoutesService, HostsService, LocationContextsService, NetworkApplicationsService, NetworkConnectorsService, NetworkIPServicesService, NetworksService, RoutesService, UserGroupsService, and UsersService to reflect these changes.

[Copilot]

Pull request overview

This PR standardizes how CloudConnexa API endpoints are constructed and adds basic ID validation to fail fast on empty identifiers before making requests.

Changes:

• Introduces buildURL for consistent endpoint construction with escaped path segments.
• Adds validateID (and ErrEmptyID) and applies it across multiple service methods that require IDs.
• Updates route/connector pagination endpoints to use url.Values for safer query-string construction.

Reviewed changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
cloudconnexa/cloudconnexa.go	Adds buildURL helper (with path escaping) and validateID helper.
cloudconnexa/errors.go	Introduces ErrEmptyID used by validateID.
cloudconnexa/cloudconnexa_test.go	Adds unit tests for buildURL and validateID.
cloudconnexa/users.go	Uses buildURL and adds validateID checks for user ID-based operations.
cloudconnexa/user_groups.go	Uses buildURL and adds validateID checks for user-group ID operations.
cloudconnexa/networks.go	Uses buildURL and adds validateID checks for network ID operations.
cloudconnexa/routes.go	Adds validateID checks and uses url.Values for query params; uses buildURL for path-based endpoints.
cloudconnexa/hosts.go	Uses buildURL and adds validateID checks for host ID operations.
cloudconnexa/host_routes.go	Adds validateID checks; uses url.Values for query params; uses buildURL for ID endpoints.
cloudconnexa/host_connectors.go	Adds validateID checks; uses url.Values for query params; uses buildURL for ID endpoints.
cloudconnexa/network_connectors.go	Adds validateID checks; uses url.Values for query params; uses buildURL for ID endpoints.
cloudconnexa/host_ip_services.go	Uses buildURL and adds validateID checks for IP service ID operations.
cloudconnexa/network_ip_services.go	Uses buildURL and adds validateID checks for IP service ID operations.
cloudconnexa/host_applications.go	Uses buildURL and adds validateID checks for application ID operations.
cloudconnexa/network_applications.go	Uses buildURL and adds validateID checks for application ID operations.
cloudconnexa/location_contexts.go	Uses buildURL and adds validateID checks for location-context ID operations.
cloudconnexa/dns_records.go	Uses buildURL and adds validateID checks for DNS record ID operations.
cloudconnexa/devices.go	Uses buildURL and adds validateID checks for device ID operations.
cloudconnexa/access_groups.go	Uses buildURL and adds validateID checks for access-group ID operations.

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