Remove Iridium (demo-only) and add version display

- Remove Iridium satellite decoding feature (was placeholder/demo only)
  - Delete routes/iridium.py
  - Remove Iridium UI elements from index.html
  - Remove Iridium CSS styles
  - Remove Iridium dependencies and logger
  - Clean up SDR docstrings mentioning Iridium

- Add version number display (fixes #31)
  - Add VERSION constant to config.py
  - Add --version / -V CLI flag to intercept.py
  - Display version badge in web UI header

utils/sdr/base.py

@@ -83,7 +83,7 @@ class CommandBuilder(ABC):
         squelch: Optional[int] = None
     ) -> list[str]:
         """
-        Build FM demodulation command (for pager, iridium).
+        Build FM demodulation command (for pager decoding).
 
         Args:
             device: The SDR device to use

utils/sdr/hackrf.py

@@ -65,7 +65,7 @@ class HackRFCommandBuilder(CommandBuilder):
         """
         Build SoapySDR rx_fm command for FM demodulation.
 
-        For pager decoding and iridium capture with HackRF.
+        For pager decoding with HackRF.
         """
         device_str = self._build_device_string(device)
 

utils/sdr/limesdr.py

@@ -46,7 +46,7 @@ class LimeSDRCommandBuilder(CommandBuilder):
         """
         Build SoapySDR rx_fm command for FM demodulation.
 
-        For pager decoding and iridium capture with LimeSDR.
+        For pager decoding with LimeSDR.
         """
         device_str = self._build_device_string(device)
 

utils/sdr/rtlsdr.py

@@ -40,7 +40,7 @@ class RTLSDRCommandBuilder(CommandBuilder):
         """
         Build rtl_fm command for FM demodulation.
 
-        Used for pager decoding and iridium capture.
+        Used for pager decoding.
         """
         cmd = [
             'rtl_fm',