Changes

convolve: avoid function pointer casts by adding wrapper functions

Introduce _base_convolve_*_void() wrappers matching the expected
function pointer signatures and use them instead of casting
_base_convolve_* functions to (void *).

This removes unsafe function pointer casts and improves
type safety, which is required for stricter toolchains and
non-native targets (e.g. WebAssembly)

Change-Id: Idecb118be285eb3e4691d1761d0d8fa24fd80c75

transceiver: add optional WebSDR device support

- Add support for WebSDR devices enabled via the --with-websdr
configure flag.
- add libosmo-trx-websdr library and pkg-config file
- update .gitignore for wasm and pkg-config artifacts

Change-Id: Ia0d340c323c2eea28fbe82601ba0af7cfbd68f6d

build: detect pthread_setname_np and sched_* APIs, guard usage

Add configure checks for pthread_setname_np and sched_* functions.
Wrap their usage with HAVE_* guards to avoid build failures on
platforms where they are unavailable.

Return -ENOTSUP for unsupported scheduler operations.

Improves portability across non-Linux and restricted environments
(e.g. WebAssembly).

Change-Id: Ic3f1492544439d88c5e6683330c6696de1c2f85b

device: add WebSDR radio backend

Introduce a new optional WebSDR device backend, enabled via
--with-websdr.

Add WebSDRDevice implementation and build integration, providing
a RadioDevice interface backed by callback hooks for control and
sample I/O.

Intended for Web-based deployments where osmo-trx interacts with
SDR hardware via a WebSDR/WebUSB frontend.

Change-Id: Ie459cbd70388dd8ff5b89221d30770bab0bd9014