lxd: Async load-balancer endpoints

[MusicDin]

This PR converts network load-balancer endpoints from synchronous to asynchronous, returning operations instead of immediate responses.

API extension: storage_and_network_operations (extension already landed).

Network Load Balancers:

• POST /1.0/networks/{name}/load-balancers
• PUT /1.0/networks/{name}/load-balancers/{listen}
• PATCH /1.0/networks/{name}/load-balancers/{listen}
• DELETE /1.0/networks/{name}/load-balancers/{listen}

[Copilot]

Pull request overview

This PR updates the network load-balancer REST API in LXD to use asynchronous operations (202 + operation objects) for create/update/delete, aligning these endpoints with the storage_and_network_operations API extension and updating the Go client and lxc CLI accordingly.

Changes:

• Convert network load-balancer POST/PUT/PATCH/DELETE handlers to schedule operations and return operations.OperationResponse.
• Update the Go client interfaces/implementations and lxc network load-balancer commands to handle returned operations (including reading listen_address from operation metadata for auto-allocation).
• Update OVN cluster notifier calls to wait for the remote operation to complete; update REST API documentation to reflect 202/Operation responses.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
lxd/network/driver_ovn.go	Wait for remote load-balancer operations when notifying other cluster members.
lxd/network_load_balancers.go	Switch LB create/update/delete endpoints to async operations, add operation metadata + lifecycle emission in op run hook.
lxd/db/operationtype/operation_type.go	Add new operation types and map entity types/descriptions (but currently contains critical mapping issues).
lxc/network_load_balancer.go	Adapt CLI to new operation-returning client methods; prefer operation metadata for listen address.
doc/rest-api.yaml	Update REST API responses for LB endpoints from 200 sync to 202 operation.
client/lxd_network_load_balancers.go	Change LB methods to return Operation, with fallback to synchronous behavior when the extension is absent.
client/interfaces.go	Update InstanceServer load-balancer method signatures to return Operation.

[Copilot]

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

[Copilot]

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 4 comments.