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

static/css/index.css

@@ -96,6 +96,16 @@ header h1 {
     text-shadow: 0 0 30px var(--accent-cyan-dim);
 }
 
+.version-badge {
+    font-size: 0.35em;
+    font-weight: 400;
+    letter-spacing: 1px;
+    color: var(--text-muted);
+    vertical-align: middle;
+    margin-left: 5px;
+    opacity: 0.7;
+}
+
 header p {
     color: var(--text-secondary);
     font-size: 14px;
@@ -2059,46 +2069,6 @@ header p {
     color: var(--accent-cyan);
 }
 
-/* Iridium Burst Styles */
-.iridium-warning {
-    padding: 12px;
-    margin-bottom: 15px;
-    background: rgba(255, 102, 0, 0.1);
-    border: 1px solid var(--accent-orange);
-    border-radius: 4px;
-    color: var(--accent-orange);
-    font-size: 12px;
-}
-
-.iridium-warning strong {
-    display: block;
-    margin-bottom: 4px;
-}
-
-.burst-card {
-    padding: 10px;
-    margin-bottom: 6px;
-    background: var(--bg-secondary);
-    border: 1px solid var(--border-color);
-    border-left: 3px solid #9370DB;
-    font-family: monospace;
-    font-size: 11px;
-}
-
-.burst-time {
-    color: var(--text-secondary);
-}
-
-.burst-freq {
-    color: #9370DB;
-    font-weight: 600;
-}
-
-.burst-data {
-    color: var(--text-primary);
-    word-break: break-all;
-}
-
 /* Popout window styles */
 .popout-container {
     position: fixed;