feat: batch support for get_term_info and run_query, client IP logging

- get_term_info accepts single ID or array of IDs, fetched in parallel
- run_query accepts array of IDs with shared query_type, or queries
  array of {id, query_type} pairs for mixed batch requests
- Batch results keyed by ID (get_term_info) or "ID::query_type" (run_query)
- Single-call responses unchanged (backward compatible)
- GA4 analytics expanded: one event per ID in batch with batch_size/batch_index
- Client IP extracted from X-Forwarded-For/X-Real-IP for HA proxy
- Client IP included in server logs and GA4 events
- Bump version to 1.6.0

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

Author: Robbie1977

package.json

@@ -1,6 +1,6 @@
 {
   "name": "vfb3-mcp",
-  "version": "1.5.0",
+  "version": "1.6.0",
   "description": "MCP server for VirtualFlyBrain API integration",
   "main": "index.js",
   "scripts": {