Add wiki-explorer-server example (#122)

Interactive Wikipedia link graph visualization using force-graph with:
- Force-directed graph layout for exploring page connections
- Node expansion to reveal first-degree Wikipedia links
- Visual state tracking (blue=default, green=expanded, red=error)
- Direct browser access to Wikipedia pages

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude <noreply@anthropic.com>

examples/wiki-explorer-server/src/d3-force-3d.d.ts

@@ -0,0 +1,28 @@
+declare module "d3-force-3d" {
+  interface Force {
+    (alpha: number): void;
+    initialize?: (nodes: unknown[], ...args: unknown[]) => void;
+  }
+
+  interface ManyBodyForce extends Force {
+    strength(value: number): ManyBodyForce;
+  }
+
+  interface LinkForce extends Force {
+    distance(value: number): LinkForce;
+  }
+
+  interface CollideForce extends Force {
+    radius(value: number): CollideForce;
+  }
+
+  interface CenterForce extends Force {
+    x(value: number): CenterForce;
+    y(value: number): CenterForce;
+  }
+
+  export function forceManyBody(): ManyBodyForce;
+  export function forceLink(): LinkForce;
+  export function forceCollide(radius?: number): CollideForce;
+  export function forceCenter(x?: number, y?: number): CenterForce;
+}