feat: replace 2 m placeholder with station pattern table from the workbook (Task 5)

Source: RAG 지보패턴현황_20260918.xlsx, sheet 참고_지보패턴현황, 당진방향 table
(4+740..5+500, 42 contiguous rows). Lining pattern (M column) per station now
drives the lining colour and the viewer readout. Daesan table kept as reference
only (WL-4 there, not applied). Drawing patterns E-1, E-2, RP-2, WL-3 are in
neither table and stay [미확정].

Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01A5Cun3RHQKna9qxE6ybZ4A

data/verify_skeleton.json

@@ -6,15 +6,22 @@
   "road_z_5480_m": 67.311,
   "plan_chord_length_total_m (4+700..5+500)": 799.905,
   "station_range_modelled": "4745 .. 5480 (ring step 1.0 m, 736 rings)",
-  "pattern_zones (2 m, placeholder)": 368,
+  "pattern_zones (지보패턴표 당진방향)": 42,
   "pattern_coverage_all_stations": true,
   "pattern_counts": {
-    "NP-4AD-1-D-2": 62,
-    "NP-4BD-1-D-2": 62,
-    "NP-5AE-1-WL-4": 61,
-    "NP-5BE-1-WL-4": 61,
-    "NP-6A": 61,
-    "NP-6B": 61
+    "A": 5,
+    "B-1": 8,
+    "B-2": 7,
+    "C-1": 4,
+    "C-2": 2,
+    "D-1": 3,
+    "D-2": 2,
+    "P-2": 1,
+    "P-3": 2,
+    "RP-1": 3,
+    "WL-1": 1,
+    "WL-2": 2,
+    "개착부": 2
   },
   "glb_bytes": 2201764,
   "glb_reload_geometries": 5