feat(acadenice): add page templates system for R3.6 (65 tests, Patch 014)
- DB migration: acadenice_template table (JSONB content, is_built_in, is_workspace_default, usage_count)
- 3 new permissions: templates:read|create|manage — catalogue goes to 26
- NestJS AcadeniceTemplatesModule: TemplateService (CRUD + instantiate + setDefault), TemplateSeedService (5 built-ins), TemplatesController (7 endpoints)
- Built-in seed: Meeting Note, Project Brief, Daily Standup, Weekly Review, Empty Page — clone-then-edit pattern
- Frontend: templates-admin gallery (TemplatesPage /settings/templates, TemplateGallery, TemplateCard, TemplateForm)
- Frontend: TemplatePickerModal — opened via "New page from template" sidebar dropdown + /template slash command (custom DOM event)
- i18n: 39 keys FR + EN
- Tests: 40 backend (22 service + 18 controller) + 25 frontend (9 client + 9 page + 7 card) = 65 tests
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Corentin
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