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

app/db.py

@@ -184,6 +184,27 @@ def init_db():
                 position INTEGER NOT NULL DEFAULT 0,
                 created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
             );
+
+            -- v1.4.0: Propriétés Avancées — collection_properties (remplace project_properties)
+            CREATE TABLE IF NOT EXISTS collection_properties (
+                id INTEGER PRIMARY KEY AUTOINCREMENT,
+                collection_id INTEGER NOT NULL REFERENCES collections(id) ON DELETE CASCADE,
+                name TEXT NOT NULL,
+                prop_type TEXT NOT NULL DEFAULT 'text',
+                options_json TEXT DEFAULT '[]',
+                number_format TEXT DEFAULT 'number',
+                related_collection_id INTEGER REFERENCES collections(id),
+                reverse_name TEXT,
+                relation_property_id INTEGER REFERENCES collection_properties(id),
+                target_property_id INTEGER REFERENCES collection_properties(id),
+                rollup_function TEXT,
+                formula_expression TEXT,
+                position INTEGER NOT NULL DEFAULT 0,
+                required BOOLEAN NOT NULL DEFAULT 0,
+                visible_in_views BOOLEAN NOT NULL DEFAULT 1,
+                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+                UNIQUE(collection_id, name)
+            );
         """)
         # Migration: add parent_id if missing (v1.0.0+)
         try: