style(kg-map): unified arc color + entity search with simp/trad

- Arc color: solid yellow #eab308 (was cyan→magenta gradient)
- Entity search: AutoComplete with opencc-js simp↔trad support
- Fly-to on search result selection
- Taiwan label: pre-patch style.json to show 台灣省
- School dots: blue #2563eb (was orange, too close to person red)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: xr843

frontend/src/components/kg-map/DeckGLMap.tsx

@@ -224,8 +224,8 @@ export default function DeckGLMap({
           data: filteredArcs,
           getSourcePosition: (d) => [d.teacher_lng, d.teacher_lat],
           getTargetPosition: (d) => [d.student_lng, d.student_lat],
-          getSourceColor: [6, 182, 212, 200],
-          getTargetColor: [219, 39, 119, 200],
+          getSourceColor: [234, 179, 8, 200],
+          getTargetColor: [234, 179, 8, 200],
           getWidth: 1.5,
           greatCircle: true,
           pickable: true,

frontend/src/pages/KGMapPage.tsx

@@ -229,7 +229,7 @@ export default function KGMapPage() {
               ))}
               {showArcs && (
                 <span className="kg-map-legend-item">
-                  <span className="kg-legend-line" style={{ background: "linear-gradient(90deg, #06b6d4, #db2777)" }} />
+                  <span className="kg-legend-line" style={{ background: "#eab308" }} />
                   师承
                 </span>
               )}