feat(v1.3.0): Database Concept — collections, pages, views, GiteaBoardCompat

Database foundation:
- New tables: collections, collection_pages, collection_views
- Router /db with full CRUD API
- GiteaBoardCompat adapter for legacy board compatibility
- CSRF exemption for /db/ routes
- 34/34 tests pass
- Version bump 1.0.0 → 1.3.0
- Deployed and verified on Docker port 8080

CHANGELOG.md

@@ -1,5 +1,27 @@
 # Changelog — FlowDeck
 
+## v1.3.0 (2026-07-10) — Database Concept
+
+### Added
+- **Nouvelles tables**: `collections`, `collection_pages`, `collection_views` — fondation Database Notion
+- **Router `/db`**: API CRUD complète pour collections et pages
+  - `GET/POST /db/api` — lister/créer collections
+  - `GET/PUT/DELETE /db/api/{id}` — lire/modifier/supprimer collection
+  - `GET/POST /db/{id}/pages/api` — lister/créer pages
+  - `GET/PUT/DELETE /db/pages/{id}/api` — CRUD page standalone
+  - `GET /db/{id}` — vue HTML basique par collection
+- **GiteaBoardCompat**: adaptateur boards Gitea legacy → Collections
+  - `GET /db/boards/api` — liste boards comme pseudo-collections
+  - `GET /db/board/{owner}/{repo}/api` — board spécifique comme collection
+  - `POST /db/board/{owner}/{repo}/sync` — sync board → vraie collection
+- **Tests**: 6 nouveaux tests (34/34 passent, +21%)
+- **CSRF**: `/db/` exempté (API interne)
+
+### Changed
+- Version 1.0.0 → 1.3.0 (main.py, api.py, health)
+- `db.py` init: 3 nouvelles tables + index
+- Architecture DB: `collection_pages` utilise `property_values_json` (JSON flexible)
+
 ## v1.0.0 (2026-07-08) — Production
 
 ### Added