fix: remove duplicate gemini router registration

The merge had accidentally included duplicate gemini router routes.
Lint-staged fixed this automatically but the fix wasn't included in commit.

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

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

Author: cuipengfei

src/server.ts

@@ -27,7 +27,6 @@ server.route("/token", tokenRoute)
 server.route("/v1/chat/completions", completionRoutes)
 server.route("/v1/models", modelRoutes)
 server.route("/v1/embeddings", embeddingRoutes)
-server.route("/", geminiRouter)
 
 // Anthropic compatible endpoints
 server.route("/v1/messages", messageRoutes)