Add changeset for version 2.0.0 major release

Co-authored-by: huangyiirene <7665279+huangyiirene@users.noreply.github.com>

Author: Copilot

.changeset/major-version-unification.md

@@ -0,0 +1,55 @@
+---
+"@objectql/cli": major
+"@objectql/core": major
+"@objectql/create": major
+"@objectql/driver-excel": major
+"@objectql/driver-fs": major
+"@objectql/driver-localstorage": major
+"@objectql/driver-memory": major
+"@objectql/driver-mongo": major
+"@objectql/driver-redis": major
+"@objectql/driver-sql": major
+"@objectql/platform-node": major
+"@objectql/sdk": major
+"@objectql/server": major
+"@objectql/types": major
+---
+
+**Major Release: Version 2.0.0 - Unified Package Versioning**
+
+This is a coordinated major release that unifies all ObjectQL packages to version 2.0.0, establishing a synchronized versioning strategy across the entire ecosystem.
+
+### 🎯 Key Changes
+
+- **Unified Versioning**: All core packages now share the same version number (2.0.0)
+- **Fixed Group Management**: Updated changeset configuration to include all @objectql packages in the fixed versioning group
+- **Simplified Maintenance**: Future releases will automatically maintain version consistency across the entire monorepo
+
+### 📦 Packages Included
+
+All ObjectQL packages are now synchronized at version 2.0.0:
+- Foundation: `@objectql/types`, `@objectql/core`, `@objectql/platform-node`
+- Drivers: `@objectql/driver-sql`, `@objectql/driver-mongo`, `@objectql/driver-redis`, `@objectql/driver-fs`, `@objectql/driver-memory`, `@objectql/driver-localstorage`, `@objectql/driver-excel`, `@objectql/sdk`
+- Runtime: `@objectql/server`
+- Tools: `@objectql/cli`, `@objectql/create`
+
+### ⚠️ Breaking Changes
+
+This is marked as a major version due to the version number change. The API remains stable and backward compatible. No code changes are required when upgrading.
+
+### 🔄 Migration
+
+Simply update all `@objectql/*` packages to `^2.0.0` in your `package.json`:
+
+```json
+{
+  "dependencies": {
+    "@objectql/core": "^2.0.0",
+    "@objectql/driver-sql": "^2.0.0"
+  }
+}
+```
+
+### 📝 Notes
+
+This release establishes a foundation for coordinated major releases across the ObjectQL ecosystem, ensuring compatibility and simplifying dependency management for users.