[feat](trx-core): add periodic TLE refresh from CelesTrak

Fetch fresh weather satellite TLEs from CelesTrak on startup and then
once every 24 hours. The dynamic TLE store is checked first in
tle_for_satellite(), falling back to the existing hardcoded TLEs when
the fetch has not yet completed or fails.

- Add global TLE_STORE (RwLock<HashMap<norad_id, (line1, line2)>>)
- Add parse_tle_response() to parse 3-line TLE format
- Add refresh_tles_from_celestrak() async fetch + store update
- Add spawn_tle_refresh_task() for startup + daily refresh loop
- Refactor tle_for_satellite() into norad_id lookup + store check
- Spawn refresh task in trx-server alongside wxsat decoder tasks
- Add reqwest (rustls-tls) dependency to trx-core

https://claude.ai/code/session_01RB19i93dnemDYLcfrhyhqc
Signed-off-by: Claude <noreply@anthropic.com>

src/trx-server/src/main.rs

@@ -794,6 +794,9 @@ fn spawn_rig_audio_stack(
             }
         }));
 
+        // Start periodic TLE refresh from CelesTrak (on start + once/day).
+        trx_core::geo::spawn_tle_refresh_task();
+
         // Spawn weather satellite APT decoder task
         let wxsat_pcm_rx = pcm_tx.subscribe();
         let wxsat_state_rx = state_rx.clone();