Initial commit: offline flight planner (Rust, PFPX-class)

Clean-room reproduction of PFPX: route generation + IFPS validation + OFP.
Independent design — official ICAO/EUROCONTROL data only (RAD, FRA points,
IFPUV oracle); no community FPL sources.

Workspace crates: core (routing/discover/rad/navdata/perf/export),
cli, server, rad (Annex parser), gui (Tauri v2 + React + MapLibre).
Route discovery: oracle-in-the-loop repair against Eurocontrol IFPUV.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

crates/core/tests/fixtures/earth_fix.dat

@@ -0,0 +1,9 @@
+I
+1101 Version - test fixture, not real navdata
+
+ 49.000000000    2.500000000  ABEAM ENRT LF 1000001
+ 49.500000000    2.000000000  BEACN ENRT LF 1000002
+ 50.000000000    1.000000000  CROSS ENRT LF 1000003
+ 50.500000000    0.000000000  DOVER ENRT EG 1000004
+ 51.000000000   -0.500000000  ENTRY ENRT EG 1000005
+99