Migrated template endpoints to nexus service

[jeroenrinzema]

This PR migrates all used template endpoints to the nexus service.

[Copilot]

Pull request overview

This PR migrates template API endpoints from a flat /projects/{projectID}/templates/{templateID} structure to a nested /projects/{projectID}/campaigns/{campaignID}/templates/{templateID} structure under the nexus service, establishing templates as campaign-scoped resources.

Key Changes:

• Added campaign-scoped template endpoints (create, update, delete) to the nexus service API
• Updated GetTemplate endpoint to include campaignID parameter
• Migrated frontend API calls to use the new campaign-scoped template endpoints

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
services/nexus/oapi/resources_gen.go	Generated client/server code for new campaign-scoped template endpoints
services/nexus/oapi/resources.yml	OpenAPI specification defining new template endpoints under campaigns
services/nexus/internal/store/templates.go	Added UpdateTemplate and DeleteTemplate store methods
services/nexus/internal/http/controllers/v1/templates.go	Implemented CreateTemplate, UpdateTemplate, and DeleteTemplate handlers
services/nexus/internal/http/controllers/v1/templates_test.go	Added tests for new template CRUD operations
services/console/src/views/router.tsx	Updated template route loader to use campaign-scoped API
services/console/src/views/campaign/template/mail/editor/Editor.tsx	Updated template save handler to use campaign-scoped update
services/console/src/views/campaign/template/Template.tsx	Updated template creation to use campaign-scoped API
services/console/src/views/campaign/template/Content.tsx	Updated template update to use campaign-scoped API
services/console/src/views/campaign/setup/Setup.tsx	Updated template creation in setup flow
services/console/src/types.ts	Removed campaign_id and type from template create/update params
services/console/src/api.ts	Moved template endpoints under campaigns.templates namespace

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