Fix IP address not being set on sessions from localhost

The extractClientIP() function only checked proxy headers (X-Forwarded-For,
CF-Connecting-IP, etc.) which don't exist when running locally without a proxy.

Changes:
- Add clientIP field to APIContext
- Use Bun's server.requestIP() to get client IP from direct socket connection
- Update getGeoInfo() to accept fallback IP parameter
- Pass context.clientIP to getGeoInfo() in auth procedures

Now sessions will have IP address set even for local development (::1 or 127.0.0.1).

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/api-server/src/index.ts

@@ -39,7 +39,7 @@ const rpName = Bun.env.RP_NAME ?? DEFAULT_RP_NAME;
 
 Bun.serve({
   port,
-  async fetch(request) {
+  async fetch(request, server) {
     const url = new URL(request.url);
 
     if (url.pathname.startsWith("/api/v1/rpc")) {
@@ -50,6 +50,10 @@ Bun.serve({
       // Create response headers for setting cookies
       const resHeaders = new Headers();
 
+      // Get client IP from Bun's server (fallback for when no proxy headers)
+      const socketInfo = server.requestIP(request);
+      const clientIP = socketInfo?.address ?? null;
+
       const context: APIContext = {
         db,
         origin,
@@ -57,6 +61,7 @@ Bun.serve({
         rpName,
         reqHeaders: request.headers,
         resHeaders,
+        clientIP,
       };
 
       const { response } = await handler.handle(request, {