* fix(network): cloudsync_network_check_changes must not return the nrows value in case of error

`SELECT cloudysnc_network_check_changes();` was returning "Runtime error: 0" in case of error response from the cloudsync microservice instead of the real error message

* feat(rls): add complete support for RLS with batch merge in cloudsync_payload_apply

* Feat/add support for status endpoint (#10)

* feat(network): add support for new status endpoint

* refactor(network): structured JSON responses for sync functions. 
Example: {"send":{"status":"synced","localVersion":5,"serverVersion":5},"receive":{"rows":3,"tables":["tasks"]}}

* Feat/network support for multi org cloudsync (#11)

* Disable notnull prikey constraints (#12)

* The cloudsync extension now enforces NULL primary key rejection at runtime (any write with a NULL PK returns an error), so the explicit NOT NULL constraint on primary key  columns is no longer a schema requirement

* test: add null primary key rejection tests for SQLite and PostgreSQL

* docs: remove NOT NULL requirement from primary key definitions

The extension now enforces NULL primary key rejection at runtime, so
the explicit NOT NULL constraint on PK columns is no longer a schema
requirement. Replace the "must be NOT NULL" guidance with a note about
runtime enforcement.

* docs: add first draft of PERFORMANCE.md and CHANGELOG.md

* fix(postgresql): resolve commit_alter crash and BYTEA handling in column_text

Guard savepoint commit/rollback against missing subtransactions to prevent
segfault in autocommit mode. Add BYTEA support to database_column_text so encoded PKs are readable during refill_metatable after ALTER TABLE.
Enable alter table sync test (31).

* test: new alter table test for postgres

* feat: update endpoints to use databaseMangedId for /v2/cloudsync api
* feat(network)!: replace URL connection string with a UUID (managedDatabaseId)

BREAKING CHANGE: cloudsync_network_init now accepts a UUID string instead of the previous URL string. URL connection strings are no longer accepted. The managed database identifier returned by the CloudSync service when a new database is registered for sync. For SQLiteCloud projects, this value can be obtained from the project's OffSync page on the dashboard.

* docs: update docs for the new managedDatabaseId arg for cloudsync_network_init

* docs(examples): update example for the new managedDatabaseId arg for cloudsync_network_init