@mytec: feat: Phase 3.0 Architecture Refactor ✅

Major refactoring of RFCP backend:
- Modular propagation models (8 models)
- SharedMemoryManager for terrain data
- ProcessPoolExecutor parallel processing
- WebSocket progress streaming
- Building filtering pipeline (351k → 15k)
- 82 unit tests

Performance: Standard preset 38s → 5s (7.6x speedup)

Known issue: Detailed preset timeout (fix in 3.1.0)

frontend/src/constants/frequencies.ts

@@ -93,6 +93,17 @@ export const COMMON_FREQUENCIES: FrequencyBand[] = [
 
 export const QUICK_FREQUENCIES = [800, 1800, 1900, 2100, 2600];
 
+// Tactical radio presets for UHF/VHF
+export const TACTICAL_FREQUENCIES = [150, 450];
+
+// All quick frequencies grouped by band type
+export const FREQUENCY_GROUPS = {
+  LTE: [800, 1800, 1900, 2100, 2600],
+  UHF: [450],
+  VHF: [150],
+  '5G': [3500],
+} as const;
+
 export function getFrequencyInfo(frequency: number): FrequencyBand | null {
   return (
     COMMON_FREQUENCIES.find((band) => Math.abs(band.value - frequency) < 50) ||