Translate the whole project to English and fix outdated comments and help

Comments, docstrings, logs, CLI help, map UI, legends, PDF sheet, scripts,
compose files and AGENTS.md are now English. Data keys stay unchanged
(relief_oriente, densite_sol, visualisations/, API JSON keys, link params).
Wrong comments and help defaults found along the way are corrected.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.dockerignore

@@ -1,9 +1,9 @@
-# Données volumineuses montées au runtime, jamais bakées dans l'image
+# Bulky data mounted at runtime, never baked into the image
 input/
 output/
 data/
 
-# Divers non nécessaire au build
+# Misc files not needed for the build
 .git/
 audit-findings/
 docs/
@@ -11,7 +11,7 @@ download_lidar.sh
 run.sh
 docker-compose.yml
 
-# Caches Python
+# Python caches
 **/__pycache__/
 *.pyc
 .pytest_cache/