feat: implement preferred port allocation and per-address enable/disable

- Add AvailablePorts::try_alloc() with SSL tracking (BTreeMap<u16, bool>)
- Add DerivedAddressInfo on BindInfo with private_disabled/public_enabled/possible sets
- Add Bindings wrapper with Map impl for patchdb indexed access
- Flatten HostAddress from single-variant enum to struct
- Replace set-gateway-enabled RPC with set-address-enabled
- Remove hostname_info from Host; computed addresses now in BindInfo.addresses.possible
- Compute possible addresses inline in NetServiceData::update()
- Update DB migration, SDK types, frontend, and container-runtime

sdk/base/lib/osBindings/DerivedAddressInfo.ts

@@ -0,0 +1,17 @@
+// This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
+import type { HostnameInfo } from './HostnameInfo'
+
+export type DerivedAddressInfo = {
+  /**
+   * User-controlled: private-gateway addresses the user has disabled
+   */
+  privateDisabled: Array<HostnameInfo>
+  /**
+   * User-controlled: public-gateway addresses the user has enabled
+   */
+  publicEnabled: Array<HostnameInfo>
+  /**
+   * COMPUTED: NetServiceData::update — all possible addresses for this binding
+   */
+  possible: Array<HostnameInfo>
+}