Remove RRIM and Multi-Hillshade RGB, fix DTM resolution reuse bug, add --init to docker run

- Remove generate_rrim, generate_multi_hillshade, _compute_openness_both
- Remove corresponding VIZ_STEPS entries, COLORMAPS, RGB_LEGENDS, and tests
- Fix DTM resolution mismatch: existing DTM at different resolution is now
  regenerated instead of silently reused
- Propagate actual DTM resolution to visualizations and rendering
- Add --init to docker run commands for proper signal handling on Ctrl+C
- Add .playwright-mcp/ to .gitignore

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

lidar_pipeline/rendering.py

@@ -178,16 +178,6 @@ RGB_LEGENDS = {
         'legend': 'Carte IGN\nPlan topographique',
         'description': 'Carte topographique IGN (Plan IGN)',
     },
-    'rrim': {
-        'title': 'RRIM — Red Relief Image Map (composite RGB)',
-        'legend': 'Rouge = Openness positive (crêtes, levées)\nVert = Pente inversée (plat = clair)\nBleu = Openness négative (fossés, dépressions)',
-        'description': 'Composite RGB synthétique pour prospection archéologique',
-    },
-    'multi_hillshade': {
-        'title': 'Hillshade Composite RGB (3 azimuts)',
-        'legend': 'Rouge = Éclairage NW (315°)\nVert = Éclairage SE (135°)\nBleu = Éclairage NE (45°)',
-        'description': 'Composite couleur révélant les structures selon leur orientation',
-    },
 }
 
 
@@ -300,7 +290,7 @@ def tif_to_png(tif_file, vis_dir, resolution, keep_tif=False, source_info=None):
 
     try:
         with rasterio.open(tif_file) as src:
-            is_rgb = src.count >= 3 and any(k in str(tif_file) for k in ('ortho', 'topo', 'rrim', 'multi_hillshade'))
+            is_rgb = src.count >= 3 and any(k in str(tif_file) for k in ('ortho', 'topo'))
 
             if is_rgb:
                 data = src.read([1, 2, 3])