docs: drop the SMPP bridge mentions (not installed, not used)

README.md

@@ -750,7 +750,7 @@ The bundled Python server wraps [pySim](https://osmocom.org/projects/pysim/wiki)
 - **Python 3.9+** with `pip`, and **Git** — the app runs on 3.9+, but the **SCP81 TLS-PSK listener needs Python 3.13+** (`ssl`'s PSK callbacks).
 - **Python venv support** — `setup.sh` creates `.venv`; if that fails with `ensurepip is not available` (Debian/Ubuntu ship the venv module separately), install it (`sudo apt install python3-venv`) and run `./setup.sh` again.  An incomplete `.venv` left by the failed run is removed automatically.
 - **Smart card reader** (PC/SC or serial/FTDI) — PC/SC is preferable (`pcsc-lite` + `ccid` on Linux). `pyscard` has no Linux wheels, so it builds from source: install the PC/SC header package too (`libpcsclite-dev` on Debian/Ubuntu, `pcsc-lite-devel` on Fedora; on Arch `pcsclite` includes them).
-- **Windows** — use **Python 3.13 (strongly recommended)**: `pyscard` ships precompiled wheels for it, so nothing needs compiling; on **3.14** the `pyscard` and some pysim dependency wheels are missing and build from source (needs MSVC C++ Build Tools). The SMPP bridge (`smpp.twisted3`) is intentionally skipped on Windows.
+- **Windows** — use **Python 3.13 (strongly recommended)**: `pyscard` ships precompiled wheels for it, so nothing needs compiling; on **3.14** the `pyscard` and some pysim dependency wheels are missing and build from source (needs MSVC C++ Build Tools).
 
 ### Scripts
 
@@ -773,8 +773,8 @@ pysim-simple-server --http-port 8080
 ```
 
 On Windows use `setup.bat` instead: it installs pysim's dependencies from
-`requirements-pysim.txt` and pysim itself with `--no-deps`, so the SMPP bridge (and
-its MSVC build chain) is not pulled in.
+`requirements-pysim.txt` and pysim itself with `--no-deps`, so pysim's optional
+dependencies are not pulled in.
 
 ### CLI options