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

intercept.py

@@ -6,7 +6,7 @@ A comprehensive signal intelligence tool featuring:
 - Pager decoding (POCSAG/FLEX)
 - 433MHz sensor monitoring
 - ADS-B aircraft tracking with WarGames-style display
-- Satellite pass prediction and Iridium burst detection
+- Satellite pass prediction
 - WiFi reconnaissance and drone detection
 - Bluetooth scanning
 
@@ -25,6 +25,12 @@ if sys.version_info < (3, 9):
     print("  - Or use pyenv to install a newer version")
     sys.exit(1)
 
+# Handle --version early before other imports
+if '--version' in sys.argv or '-V' in sys.argv:
+    from config import VERSION
+    print(f"INTERCEPT v{VERSION}")
+    sys.exit(0)
+
 import site
 
 # Ensure user site-packages is available (may be disabled when running as root/sudo)