Generate Java SDK v2.6.x reference docs; fix slug parsing for versioned prefixes

- Use lastIndexOf('-') for local name extraction so "v2-Category-method" slugs
  correctly yield "method" as the file name (not "Category-method")
- Fix config.json java-v2.6.x table ID (tblCwLhDHim25oVt)
- Generate 215 Java v2.6.x reference docs

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