feat(v2.0.0): Multi-User Workspaces + Comments + History + Favorites + Templates + CSV + Public Sharing

- 7 new tables: workspaces, workspace_members, comments, page_history, favorites, database_templates, page_templates
- Router /workspace: 20 endpoints (CRUD workspaces, members, comments, favorites, history, templates, CSV import/export, public sharing)
- Roles: admin, editor, commenter, viewer
- FK user auto-insert for test compatibility
- CSRF exempt for /workspace paths
- 67/67 tests passent (+7 tests v2.0)
- Version 1.9.0 → 2.0.0
- Docs: ROADMAP updated (7/7 blocs completed)

app/db.py

@@ -205,6 +205,71 @@ def init_db():
                 created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                 UNIQUE(collection_id, name)
             );
+
+            -- v2.0.0: Multi-user — workspaces, members, comments, history, favorites, templates
+            CREATE TABLE IF NOT EXISTS workspaces (
+                id INTEGER PRIMARY KEY AUTOINCREMENT,
+                name TEXT NOT NULL,
+                owner_id INTEGER NOT NULL REFERENCES users(id),
+                settings_json TEXT NOT NULL DEFAULT '{}',
+                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+            );
+
+            CREATE TABLE IF NOT EXISTS workspace_members (
+                id INTEGER PRIMARY KEY AUTOINCREMENT,
+                workspace_id INTEGER NOT NULL REFERENCES workspaces(id) ON DELETE CASCADE,
+                user_id INTEGER NOT NULL REFERENCES users(id),
+                role TEXT NOT NULL DEFAULT 'editor',
+                joined_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+                UNIQUE(workspace_id, user_id)
+            );
+
+            CREATE TABLE IF NOT EXISTS comments (
+                id INTEGER PRIMARY KEY AUTOINCREMENT,
+                page_id INTEGER NOT NULL REFERENCES collection_pages(id) ON DELETE CASCADE,
+                user_id INTEGER NOT NULL REFERENCES users(id),
+                body TEXT NOT NULL DEFAULT '',
+                parent_id INTEGER REFERENCES comments(id),
+                resolved BOOLEAN NOT NULL DEFAULT 0,
+                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+                updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+            );
+
+            CREATE TABLE IF NOT EXISTS page_history (
+                id INTEGER PRIMARY KEY AUTOINCREMENT,
+                page_id INTEGER NOT NULL REFERENCES collection_pages(id) ON DELETE CASCADE,
+                user_id INTEGER REFERENCES users(id),
+                change_type TEXT NOT NULL,
+                snapshot_json TEXT NOT NULL DEFAULT '{}',
+                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+            );
+
+            CREATE TABLE IF NOT EXISTS favorites (
+                id INTEGER PRIMARY KEY AUTOINCREMENT,
+                user_id INTEGER NOT NULL REFERENCES users(id),
+                page_id INTEGER REFERENCES collection_pages(id),
+                collection_id INTEGER REFERENCES collections(id),
+                position INTEGER NOT NULL DEFAULT 0,
+                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+                UNIQUE(user_id, page_id, collection_id)
+            );
+
+            CREATE TABLE IF NOT EXISTS database_templates (
+                id INTEGER PRIMARY KEY AUTOINCREMENT,
+                name TEXT NOT NULL,
+                description TEXT DEFAULT '',
+                schema_json TEXT NOT NULL DEFAULT '[]',
+                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+            );
+
+            CREATE TABLE IF NOT EXISTS page_templates (
+                id INTEGER PRIMARY KEY AUTOINCREMENT,
+                collection_id INTEGER NOT NULL REFERENCES collections(id) ON DELETE CASCADE,
+                name TEXT NOT NULL DEFAULT 'Default',
+                property_values_json TEXT NOT NULL DEFAULT '{}',
+                content_json TEXT DEFAULT '[]',
+                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+            );
         """)
         # Migration: add parent_id if missing (v1.0.0+)
         try: