feat(v1.4.0): Propriétés Avancées — collection_properties, 21 types, API CRUD

- Table collection_properties (21 types Notion: number, checkbox, url, email, phone, status, files, unique_id, ...)
- Auto-propriétés: created_time, created_by, last_edited_time, last_edited_by
- Service property_types.py: validation, formatage, auto-values
- API: GET /db/property-types/api, CRUD /db/{id}/properties/api, PUT/DELETE /db/properties/{id}/api
- 38/38 tests passent (+4 nouveaux tests v1.4)
- Version 1.3.0 → 1.4.0
- Docs: ROADMAP, CHANGELOG, WORKLOAD, README à jour

CHANGELOG.md

@@ -1,5 +1,19 @@
 # Changelog — FlowDeck
 
+## v1.4.0 (2026-07-10) — Propriétés Avancées
+
+### Added
+- **Table `collection_properties`**: remplace `project_properties`, liée aux collections
+  - Types: title, text, number, select, multi_select, status, date, person, checkbox, url, email, phone, files, unique_id
+  - Auto-propriétés: created_time, created_by, last_edited_time, last_edited_by
+  - Relations/Rollups/Formulas: schéma prêt (colonnes dispo, implémentation v1.5)
+- **Service `property_types.py`**: 21 types définis, validation, formatage, auto-values
+- **API propriétés**: `GET /db/property-types/api`, CRUD `/{id}/properties/api`, `PUT/DELETE /properties/{id}/api`
+- **Tests**: 4 nouveaux tests (38/38 passent, +12%)
+
+### Changed
+- Version 1.3.0 → 1.4.0
+
 ## v1.3.0 (2026-07-10) — Database Concept
 
 ### Added