Remove GSM spy functionality for legal compliance

Remove all GSM cellular intelligence features including tower scanning,
signal monitoring, rogue detection, crowd density analysis, and
OpenCellID integration across routes, templates, utils, tests, and
build configuration.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Dockerfile

@@ -48,39 +48,11 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     airspy \
     limesuite \
     hackrf \
-    # GSM Intelligence (tshark for packet parsing)
-    tshark \
     # Utilities
     curl \
     procps \
     && rm -rf /var/lib/apt/lists/*
 
-# GSM Intelligence: gr-gsm (grgsm_scanner, grgsm_livemon)
-# Install from apt if available, otherwise build from source
-RUN apt-get update \
-    && apt-get install -y --no-install-recommends \
-       gnuradio gr-osmosdr gr-gsm 2>/dev/null \
-    || ( \
-       apt-get install -y --no-install-recommends \
-         gnuradio gnuradio-dev gr-osmosdr \
-         git cmake libboost-all-dev libcppunit-dev swig \
-         doxygen liblog4cpp5-dev python3-scipy python3-numpy \
-         libvolk-dev libfftw3-dev build-essential \
-       && cd /tmp \
-       && git clone --depth 1 https://github.com/bkerler/gr-gsm.git \
-       && cd gr-gsm \
-       && mkdir build && cd build \
-       && cmake .. \
-       && make -j$(nproc) \
-       && make install \
-       && ldconfig \
-       && rm -rf /tmp/gr-gsm \
-       && apt-get remove -y gnuradio-dev libcppunit-dev swig doxygen \
-          liblog4cpp5-dev libvolk-dev build-essential git cmake \
-       && apt-get autoremove -y \
-    ) \
-    && rm -rf /var/lib/apt/lists/*
-
 # Build dump1090-fa and acarsdec from source (packages not available in slim repos)
 RUN apt-get update && apt-get install -y --no-install-recommends \
     build-essential \