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

config.py

@@ -6,6 +6,9 @@ import logging
 import os
 import sys
 
+# Application version
+VERSION = "1.0.0"
+
 
 def _get_env(key: str, default: str) -> str:
     """Get environment variable with default."""
@@ -56,10 +59,6 @@ DEFAULT_DEVICE = _get_env('DEFAULT_DEVICE', '0')
 # Pager defaults
 DEFAULT_PAGER_FREQ = _get_env('PAGER_FREQ', '929.6125M')
 
-# Iridium defaults
-DEFAULT_IRIDIUM_FREQ = _get_env('IRIDIUM_FREQ', '1626.0')
-DEFAULT_IRIDIUM_SAMPLE_RATE = _get_env('IRIDIUM_SAMPLE_RATE', '2.048e6')
-
 # Timeouts
 PROCESS_TIMEOUT = _get_env_int('PROCESS_TIMEOUT', 5)
 SOCKET_TIMEOUT = _get_env_int('SOCKET_TIMEOUT', 5)
@@ -82,9 +81,6 @@ SATELLITE_UPDATE_INTERVAL = _get_env_int('SATELLITE_UPDATE_INTERVAL', 30)
 SATELLITE_TRAJECTORY_POINTS = _get_env_int('SATELLITE_TRAJECTORY_POINTS', 30)
 SATELLITE_ORBIT_MINUTES = _get_env_int('SATELLITE_ORBIT_MINUTES', 45)
 
-# Maximum burst count for Iridium monitoring
-IRIDIUM_MAX_BURSTS = _get_env_int('IRIDIUM_MAX_BURSTS', 100)
-
 
 def configure_logging() -> None:
     """Configure application logging."""