feat(v1.3.0): Step 2 — DB tables collections, collection_pages, collection_views

- Ajout des 3 nouvelles tables pour le Database Concept
- collections: base de données abstraite, indépendante de Gitea
- collection_pages: pages génériques avec parent_id et property_values_json
- collection_views: vues configurables par collection
- Mise à jour test_db_tables_exist pour inclure les nouvelles tables
- 28/28 tests passent

app/db.py

@@ -141,6 +141,49 @@ def init_db():
                 created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                 updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
             );
+
+            -- v1.3.0: Database Concept — Notion-style collections
+            CREATE TABLE IF NOT EXISTS collections (
+                id INTEGER PRIMARY KEY AUTOINCREMENT,
+                name TEXT NOT NULL,
+                description TEXT DEFAULT '',
+                icon TEXT DEFAULT '📋',
+                schema_json TEXT NOT NULL DEFAULT '[]',
+                gitea_owner TEXT,
+                gitea_repo TEXT,
+                is_locked BOOLEAN NOT NULL DEFAULT 0,
+                is_inline BOOLEAN NOT NULL DEFAULT 0,
+                parent_page_id INTEGER,
+                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+                updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+            );
+
+            CREATE TABLE IF NOT EXISTS collection_pages (
+                id INTEGER PRIMARY KEY AUTOINCREMENT,
+                collection_id INTEGER NOT NULL REFERENCES collections(id) ON DELETE CASCADE,
+                title TEXT NOT NULL DEFAULT '',
+                icon TEXT DEFAULT '📄',
+                position INTEGER NOT NULL DEFAULT 0,
+                parent_id INTEGER REFERENCES collection_pages(id),
+                gitea_issue_id INTEGER,
+                gitea_issue_number INTEGER,
+                property_values_json TEXT NOT NULL DEFAULT '{}',
+                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+                updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+            );
+            CREATE INDEX IF NOT EXISTS idx_cp_collection ON collection_pages(collection_id, position);
+            CREATE INDEX IF NOT EXISTS idx_cp_parent ON collection_pages(parent_id);
+            CREATE INDEX IF NOT EXISTS idx_cp_gitea ON collection_pages(gitea_issue_id);
+
+            CREATE TABLE IF NOT EXISTS collection_views (
+                id INTEGER PRIMARY KEY AUTOINCREMENT,
+                collection_id INTEGER NOT NULL REFERENCES collections(id) ON DELETE CASCADE,
+                name TEXT NOT NULL DEFAULT 'Default View',
+                view_type TEXT NOT NULL DEFAULT 'table',
+                config_json TEXT NOT NULL DEFAULT '{}',
+                position INTEGER NOT NULL DEFAULT 0,
+                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+            );
         """)
         # Migration: add parent_id if missing (v1.0.0+)
         try:
@@ -158,6 +201,11 @@ def init_db():
             conn.execute("ALTER TABLE pages ADD COLUMN content_format TEXT NOT NULL DEFAULT 'markdown'")
         except sqlite3.OperationalError:
             pass
+        # Migration: add deleted_at for trash/soft-delete
+        try:
+            conn.execute("ALTER TABLE pages ADD COLUMN deleted_at TEXT")
+        except sqlite3.OperationalError:
+            pass
         conn.commit()