feat(mid-section-defect): full-line bidirectional defect trace center with dual query mode

Transform /mid-section-defect from TMTT-only backward analysis into a full-line
bidirectional defect traceability center supporting all detection stations.

Key changes:
- Parameterized station detection: any workcenter group as detection station
- Bidirectional tracing: backward (upstream attribution) + forward (downstream reject rates)
- Dual query mode: date range OR LOT/工單/WAFER container-based seed resolution
- Multi-select filters for upstream station, equipment model (RESOURCEFAMILYNAME), and loss reasons
- Progressive 3-stage trace pipeline (seed-resolve → lineage → events) with streaming UI
- Equipment model lookup via resource cache instead of SPECNAME
- Session caching, auto-refresh, searchable MultiSelect with fuzzy matching
- Remove legacy tmtt-defect module (fully superseded)
- Archive openspec change artifacts

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

data/modernization_feature_flags.json

@@ -11,12 +11,11 @@
     "/resource-history": {"content_cutover_enabled": true},
     "/qc-gate": {"content_cutover_enabled": true},
     "/job-query": {"content_cutover_enabled": true},
-    "/tmtt-defect": {"content_cutover_enabled": true},
     "/admin/pages": {"content_cutover_enabled": true},
     "/admin/performance": {"content_cutover_enabled": true},
     "/tables": {"content_cutover_enabled": false},
     "/excel-query": {"content_cutover_enabled": false},
     "/query-tool": {"content_cutover_enabled": false},
-    "/mid-section-defect": {"content_cutover_enabled": false}
+    "/mid-section-defect": {"content_cutover_enabled": true}
   }
 }